diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 160c009..ad18e18 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -11,8 +11,11 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="400bdf61-8921-41d3-8f98-a0a1b0877f46" name="Default Changelist" comment="">
-      <change beforePath="$PROJECT_DIR$/day2/day2.go" beforeDir="false" afterPath="$PROJECT_DIR$/day2/day2.go" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/day3/day3.go" beforeDir="false" afterPath="$PROJECT_DIR$/day3/day3.go" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/day9/day9.go" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/day9/day9Test.txt" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/day1/day1.go" beforeDir="false" afterPath="$PROJECT_DIR$/day1/day1.go" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/helper/readFile.go" beforeDir="false" afterPath="$PROJECT_DIR$/helper/helper.go" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -44,7 +47,7 @@
     <property name="configurable.Project.GOPATH.is.expanded" value="true" />
     <property name="go.import.settings.migrated" value="true" />
     <property name="go.sdk.automatically.set" value="true" />
-    <property name="last_opened_file_path" value="$PROJECT_DIR$/day3" />
+    <property name="last_opened_file_path" value="$PROJECT_DIR$/day6" />
     <property name="settings.editor.selected.configurable" value="com.goide.configuration.GoLibrariesConfigurableProvider" />
   </component>
   <component name="RecentsManager">
@@ -53,7 +56,7 @@
       <recent name="C:\Users\karls\go\src\AoC2020" />
     </key>
   </component>
-  <component name="RunManager" selected="Go Build.go build day5.go">
+  <component name="RunManager" selected="Go Build.go build day9.go">
     <configuration name="go build day1.go" type="GoApplicationRunConfiguration" factoryName="Go Application" nameIsGenerated="true">
       <module name="AoC2020" />
       <working_directory value="$PROJECT_DIR$/day1" />
@@ -109,7 +112,7 @@
     <configuration name="go build day5.go" type="GoApplicationRunConfiguration" factoryName="Go Application" nameIsGenerated="true">
       <module name="AoC2020" />
       <working_directory value="$PROJECT_DIR$/day5" />
-      <parameters value="&quot;BFFFBBFRRR&quot;" />
+      <parameters value="day5Input.txt" />
       <kind value="FILE" />
       <filePath value="$PROJECT_DIR$/day5/day5.go" />
       <package value="AoC2020" />
@@ -117,12 +120,56 @@
       <output_directory value="$PROJECT_DIR$/day5" />
       <method v="2" />
     </configuration>
+    <configuration name="go build day6.go" type="GoApplicationRunConfiguration" factoryName="Go Application" nameIsGenerated="true">
+      <module name="AoC2020" />
+      <working_directory value="$PROJECT_DIR$/day6" />
+      <parameters value="day6Input.txt" />
+      <kind value="FILE" />
+      <filePath value="$PROJECT_DIR$/day6/day6.go" />
+      <package value="AoC2020" />
+      <directory value="$PROJECT_DIR$" />
+      <method v="2" />
+    </configuration>
+    <configuration name="go build day7.go" type="GoApplicationRunConfiguration" factoryName="Go Application" nameIsGenerated="true">
+      <module name="AoC2020" />
+      <working_directory value="$PROJECT_DIR$/day7" />
+      <parameters value="day7Input.txt" />
+      <kind value="FILE" />
+      <filePath value="$PROJECT_DIR$/day7/day7.go" />
+      <package value="AoC2020" />
+      <directory value="$PROJECT_DIR$" />
+      <method v="2" />
+    </configuration>
+    <configuration name="go build day8.go" type="GoApplicationRunConfiguration" factoryName="Go Application" nameIsGenerated="true">
+      <module name="AoC2020" />
+      <working_directory value="$PROJECT_DIR$/day8" />
+      <parameters value="day8Input.txt" />
+      <kind value="FILE" />
+      <filePath value="$PROJECT_DIR$/day8/day8.go" />
+      <package value="AoC2020" />
+      <directory value="$PROJECT_DIR$" />
+      <method v="2" />
+    </configuration>
+    <configuration name="go build day9.go" type="GoApplicationRunConfiguration" factoryName="Go Application" nameIsGenerated="true">
+      <module name="AoC2020" />
+      <working_directory value="$PROJECT_DIR$/day9" />
+      <parameters value="day9Input.txt" />
+      <kind value="FILE" />
+      <filePath value="$PROJECT_DIR$/day9/day9.go" />
+      <package value="AoC2020" />
+      <directory value="$PROJECT_DIR$" />
+      <method v="2" />
+    </configuration>
     <list>
       <item itemvalue="Go Build.go build day1.go" />
       <item itemvalue="Go Build.go build day2.go" />
       <item itemvalue="Go Build.go build day3.go" />
       <item itemvalue="Go Build.go build day4.go" />
       <item itemvalue="Go Build.go build day5.go" />
+      <item itemvalue="Go Build.go build day7.go" />
+      <item itemvalue="Go Build.go build day6.go" />
+      <item itemvalue="Go Build.go build day8.go" />
+      <item itemvalue="Go Build.go build day9.go" />
     </list>
     <recent_temporary>
       <list>
@@ -147,39 +194,39 @@
     <option name="oldMeFiltersMigrated" value="true" />
   </component>
   <component name="WindowStateProjectService">
-    <state x="448" y="103" width="1092" height="859" key="#com.intellij.execution.impl.EditConfigurationsDialog" timestamp="1607175613035">
+    <state x="351" y="0" width="1092" height="955" key="#com.intellij.execution.impl.EditConfigurationsDialog" timestamp="1607534020287">
       <screen x="0" y="0" width="1920" height="1040" />
     </state>
     <state x="-1472" y="103" key="#com.intellij.execution.impl.EditConfigurationsDialog/-1920.0.1920.1040/0.0.1920.1040@-1920.0.1920.1040" timestamp="1607019292652" />
-    <state x="448" y="103" width="1092" height="859" key="#com.intellij.execution.impl.EditConfigurationsDialog/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607175613035" />
+    <state x="351" y="0" width="1092" height="955" key="#com.intellij.execution.impl.EditConfigurationsDialog/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607534020287" />
     <state x="661" y="322" key="#com.intellij.fileTypes.FileTypeChooser" timestamp="1606836882379">
       <screen x="0" y="0" width="1920" height="1040" />
     </state>
     <state x="661" y="322" key="#com.intellij.fileTypes.FileTypeChooser/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1606836882379" />
-    <state x="739" y="287" key="FileChooserDialogImpl" timestamp="1607016918790">
+    <state x="739" y="287" key="FileChooserDialogImpl" timestamp="1607278759015">
       <screen x="0" y="0" width="1920" height="1040" />
     </state>
-    <state x="739" y="287" key="FileChooserDialogImpl/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607016918790" />
-    <state width="1877" height="304" key="GridCell.Tab.0.bottom" timestamp="1607175589852">
+    <state x="739" y="287" key="FileChooserDialogImpl/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607278759015" />
+    <state width="1877" height="266" key="GridCell.Tab.0.bottom" timestamp="1607533993744">
       <screen x="0" y="0" width="1920" height="1040" />
     </state>
     <state width="1877" height="304" key="GridCell.Tab.0.bottom/-1920.0.1920.1040/0.0.1920.1040@-1920.0.1920.1040" timestamp="1607175230302" />
-    <state width="1877" height="304" key="GridCell.Tab.0.bottom/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607175589852" />
-    <state width="1877" height="304" key="GridCell.Tab.0.center" timestamp="1607175589852">
+    <state width="1877" height="266" key="GridCell.Tab.0.bottom/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607533993744" />
+    <state width="1877" height="266" key="GridCell.Tab.0.center" timestamp="1607533993744">
       <screen x="0" y="0" width="1920" height="1040" />
     </state>
     <state width="1877" height="304" key="GridCell.Tab.0.center/-1920.0.1920.1040/0.0.1920.1040@-1920.0.1920.1040" timestamp="1607175230302" />
-    <state width="1877" height="304" key="GridCell.Tab.0.center/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607175589852" />
-    <state width="1877" height="304" key="GridCell.Tab.0.left" timestamp="1607175589852">
+    <state width="1877" height="266" key="GridCell.Tab.0.center/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607533993744" />
+    <state width="1877" height="266" key="GridCell.Tab.0.left" timestamp="1607533993743">
       <screen x="0" y="0" width="1920" height="1040" />
     </state>
     <state width="1877" height="304" key="GridCell.Tab.0.left/-1920.0.1920.1040/0.0.1920.1040@-1920.0.1920.1040" timestamp="1607175230302" />
-    <state width="1877" height="304" key="GridCell.Tab.0.left/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607175589852" />
-    <state width="1877" height="304" key="GridCell.Tab.0.right" timestamp="1607175589852">
+    <state width="1877" height="266" key="GridCell.Tab.0.left/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607533993743" />
+    <state width="1877" height="266" key="GridCell.Tab.0.right" timestamp="1607533993744">
       <screen x="0" y="0" width="1920" height="1040" />
     </state>
     <state width="1877" height="304" key="GridCell.Tab.0.right/-1920.0.1920.1040/0.0.1920.1040@-1920.0.1920.1040" timestamp="1607175230302" />
-    <state width="1877" height="304" key="GridCell.Tab.0.right/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607175589852" />
+    <state width="1877" height="266" key="GridCell.Tab.0.right/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607533993744" />
     <state x="782" y="240" key="RollbackChangesDialog" timestamp="1607174263188">
       <screen x="0" y="0" width="1920" height="1040" />
     </state>
@@ -188,10 +235,14 @@
       <screen x="0" y="0" width="1920" height="1040" />
     </state>
     <state x="461" y="165" key="SettingsEditor/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607081830252" />
-    <state x="92" y="92" width="1736" height="856" key="com.intellij.history.integration.ui.views.FileHistoryDialog" timestamp="1607174299439">
+    <state x="92" y="92" width="1736" height="856" key="com.intellij.history.integration.ui.views.FileHistoryDialog" timestamp="1607177137138">
       <screen x="0" y="0" width="1920" height="1040" />
     </state>
-    <state x="92" y="92" width="1736" height="856" key="com.intellij.history.integration.ui.views.FileHistoryDialog/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607174299439" />
+    <state x="92" y="92" width="1736" height="856" key="com.intellij.history.integration.ui.views.FileHistoryDialog/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607177137138" />
+    <state x="593" y="141" width="585" height="801" key="find.popup" timestamp="1607533841136">
+      <screen x="0" y="0" width="1920" height="1040" />
+    </state>
+    <state x="593" y="141" width="585" height="801" key="find.popup/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607533841136" />
     <state x="623" y="225" width="672" height="678" key="search.everywhere.popup" timestamp="1607081728725">
       <screen x="0" y="0" width="1920" height="1040" />
     </state>
diff --git a/day1/day1.go b/day1/day1.go
index b96efd9..7b7e47d 100644
--- a/day1/day1.go
+++ b/day1/day1.go
@@ -19,26 +19,16 @@ func main() {
 	if err != nil {
 		fmt.Println(err)
 	}
-	fmt.Println(day1(numbers))
+	fmt.Println(day1(numbers, 2020))
 	fmt.Println(day1_part2(numbers))
 }
 
-func day1(numbers []int) int {
-	goal := 2020
-	sort.Ints(numbers)
-	p1 := 0
-	p2 := len(numbers) - 1
-	for {
-		if numbers[p1]+numbers[p2] < goal {
-			p1++
-		}
-		if numbers[p1]+numbers[p2] > goal {
-			p2--
-		}
-		if numbers[p1]+numbers[p2] == goal {
-			return numbers[p1] * numbers[p2]
-		}
+func day1(numbers []int, goal int) int {
+	add1, add2, err := helper.FindAddendsForSum(numbers,goal)
+	if err != nil {
+		return 0
 	}
+	return add1 * add2
 }
 
 func day1_part2(numbers []int) (int, error) {
diff --git a/day9/day9.go b/day9/day9.go
new file mode 100644
index 0000000..e2d1001
--- /dev/null
+++ b/day9/day9.go
@@ -0,0 +1,74 @@
+package main
+
+import (
+	"AoC2020/helper"
+	"fmt"
+	"os"
+)
+
+var pointer int
+var band []int
+
+func main() {
+	args := os.Args[1:]
+	input, err := helper.GetInput(args[0])
+	if err != nil {
+		fmt.Println(err)
+	}
+	numbers, err := helper.MapToNumber(input)
+	if err != nil {
+		fmt.Println(err)
+	}
+	fmt.Printf("%v \n",numbers)
+	band = numbers
+	breaker := part1(25)
+	fmt.Println(breaker)
+	fmt.Print(part2(breaker))
+}
+
+func part1(preambleLen int) int{
+	pointer = preambleLen
+	isValid := true
+	for isValid {
+		_,_,err := helper.FindAddendsForSum(band[pointer-preambleLen:pointer],band[pointer])
+		if err != nil {
+			return band[pointer]
+			isValid = false
+		}
+		pointer++
+	}
+	return 0
+}
+
+func part2(breaker int) int{
+	for p1 := 0; p1 < len(band); p1++ {
+		for p2 := p1 + 1; p2 < len(band); p2++ {
+			array := make([]int, len(band[p1:p2]))
+			copy(array,band[p1:p2])
+			sumArray := 0
+			for _,value := range array {
+				sumArray += value
+			}
+			if sumArray == breaker {
+				fmt.Printf("%v \n" ,array)
+				var max int
+				var min int
+				for i, val := range array {
+					if i==0 || val < min {
+						min = val
+					}
+					if i==0 || val > max {
+						max = val
+					}
+				}
+				fmt.Printf("%d , %d \n" ,min, max)
+				return min + max
+			}
+		}
+	}
+	return 0
+}
+
+func run(preambleLen int)  {
+
+}
diff --git a/day9/day9Input.txt b/day9/day9Input.txt
new file mode 100644
index 0000000..83186cd
--- /dev/null
+++ b/day9/day9Input.txt
@@ -0,0 +1,1000 @@
+12
+36
+37
+31
+33
+25
+48
+39
+6
+7
+23
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+21
+13
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\ No newline at end of file
diff --git a/day9/day9Test.txt b/day9/day9Test.txt
new file mode 100644
index 0000000..cda4246
--- /dev/null
+++ b/day9/day9Test.txt
@@ -0,0 +1,20 @@
+35
+20
+15
+25
+47
+40
+62
+55
+65
+95
+102
+117
+150
+182
+127
+219
+299
+277
+309
+576
\ No newline at end of file
diff --git a/helper/readFile.go b/helper/helper.go
similarity index 59%
rename from helper/readFile.go
rename to helper/helper.go
index d94e86e..35ce7a4 100644
--- a/helper/readFile.go
+++ b/helper/helper.go
@@ -1,7 +1,9 @@
 package helper
 
 import (
+	"errors"
 	"io/ioutil"
+	"sort"
 	"strconv"
 	"strings"
 )
@@ -34,3 +36,23 @@ func MapToNumber(strings []string) ([]int, error) {
 	}
 	return numbers, nil
 }
+
+func FindAddendsForSum (possibleAddends []int, sum int) (int, int, error) {
+	var array = make([]int,len(possibleAddends))
+	copy(array,possibleAddends)
+	sort.Ints(array)
+	p1 := 0
+	p2 := len(array) - 1
+	for p1 < p2 {
+		if array[p1]+array[p2] < sum {
+			p1++
+		}
+		if array[p1]+array[p2] > sum {
+			p2--
+		}
+		if array[p1]+array[p2] == sum {
+			return array[p1] , array[p2], nil
+		}
+	}
+	return 0,0,errors.New("No fitting Addends found")
+}