diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 265a2c7..1a48591 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -11,10 +11,9 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="400bdf61-8921-41d3-8f98-a0a1b0877f46" name="Default Changelist" comment="">
-      <change afterPath="$PROJECT_DIR$/day12/day12.go" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/day12/day12Test.txt" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/day13/day13.go" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/day13/day13Test.txt" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/helper/helper.go" beforeDir="false" afterPath="$PROJECT_DIR$/helper/helper.go" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -55,7 +54,7 @@
       <recent name="C:\Users\karls\go\src\AoC2020" />
     </key>
   </component>
-  <component name="RunManager" selected="Go Build.go build day12.go">
+  <component name="RunManager" selected="Go Build.go build day13.go">
     <configuration name="go build day10.go" type="GoApplicationRunConfiguration" factoryName="Go Application" nameIsGenerated="true">
       <module name="AoC2020" />
       <working_directory value="$PROJECT_DIR$/day10" />
@@ -86,6 +85,16 @@
       <directory value="$PROJECT_DIR$" />
       <method v="2" />
     </configuration>
+    <configuration name="go build day13.go" type="GoApplicationRunConfiguration" factoryName="Go Application" temporary="true" nameIsGenerated="true">
+      <module name="AoC2020" />
+      <working_directory value="$PROJECT_DIR$/day13" />
+      <parameters value="day13Input.txt" />
+      <kind value="FILE" />
+      <filePath value="$PROJECT_DIR$/day13/day13.go" />
+      <package value="AoC2020" />
+      <directory value="$PROJECT_DIR$" />
+      <method v="2" />
+    </configuration>
     <configuration name="go build day1.go" type="GoApplicationRunConfiguration" factoryName="Go Application" nameIsGenerated="true">
       <module name="AoC2020" />
       <working_directory value="$PROJECT_DIR$/day1" />
@@ -202,9 +211,11 @@
       <item itemvalue="Go Build.go build day10.go" />
       <item itemvalue="Go Build.go build day11.go" />
       <item itemvalue="Go Build.go build day12.go" />
+      <item itemvalue="Go Build.go build day13.go" />
     </list>
     <recent_temporary>
       <list>
+        <item itemvalue="Go Build.go build day13.go" />
         <item itemvalue="Go Build.go build day12.go" />
         <item itemvalue="Go Build.go build day1.go" />
       </list>
@@ -227,11 +238,11 @@
     <option name="oldMeFiltersMigrated" value="true" />
   </component>
   <component name="WindowStateProjectService">
-    <state x="351" y="0" width="1092" height="1027" key="#com.intellij.execution.impl.EditConfigurationsDialog" timestamp="1607788436747">
+    <state x="351" y="0" width="1092" height="1040" key="#com.intellij.execution.impl.EditConfigurationsDialog" timestamp="1607870994825">
       <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="351" y="0" width="1092" height="1027" key="#com.intellij.execution.impl.EditConfigurationsDialog/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607788436747" />
+    <state x="351" y="0" width="1092" height="1040" key="#com.intellij.execution.impl.EditConfigurationsDialog/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607870994825" />
     <state x="661" y="322" key="#com.intellij.fileTypes.FileTypeChooser" timestamp="1606836882379">
       <screen x="0" y="0" width="1920" height="1040" />
     </state>
@@ -240,26 +251,26 @@
       <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="1607278759015" />
-    <state width="1877" height="386" key="GridCell.Tab.0.bottom" timestamp="1607788420906">
+    <state width="1877" height="386" key="GridCell.Tab.0.bottom" timestamp="1607871004781">
       <screen x="0" y="0" width="1920" height="1040" />
     </state>
     <state width="1877" height="386" key="GridCell.Tab.0.bottom/-1920.0.1920.1040/0.0.1920.1040@-1920.0.1920.1040" timestamp="1607708629475" />
-    <state width="1877" height="386" key="GridCell.Tab.0.bottom/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607788420906" />
-    <state width="1877" height="386" key="GridCell.Tab.0.center" timestamp="1607788420906">
+    <state width="1877" height="386" key="GridCell.Tab.0.bottom/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607871004781" />
+    <state width="1877" height="386" key="GridCell.Tab.0.center" timestamp="1607871004781">
       <screen x="0" y="0" width="1920" height="1040" />
     </state>
     <state width="1877" height="386" key="GridCell.Tab.0.center/-1920.0.1920.1040/0.0.1920.1040@-1920.0.1920.1040" timestamp="1607708629474" />
-    <state width="1877" height="386" key="GridCell.Tab.0.center/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607788420906" />
-    <state width="1877" height="386" key="GridCell.Tab.0.left" timestamp="1607788420906">
+    <state width="1877" height="386" key="GridCell.Tab.0.center/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607871004781" />
+    <state width="1877" height="386" key="GridCell.Tab.0.left" timestamp="1607871004781">
       <screen x="0" y="0" width="1920" height="1040" />
     </state>
     <state width="1877" height="386" key="GridCell.Tab.0.left/-1920.0.1920.1040/0.0.1920.1040@-1920.0.1920.1040" timestamp="1607708629474" />
-    <state width="1877" height="386" key="GridCell.Tab.0.left/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607788420906" />
-    <state width="1877" height="386" key="GridCell.Tab.0.right" timestamp="1607788420906">
+    <state width="1877" height="386" key="GridCell.Tab.0.left/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607871004781" />
+    <state width="1877" height="386" key="GridCell.Tab.0.right" timestamp="1607871004781">
       <screen x="0" y="0" width="1920" height="1040" />
     </state>
     <state width="1877" height="386" key="GridCell.Tab.0.right/-1920.0.1920.1040/0.0.1920.1040@-1920.0.1920.1040" timestamp="1607708629475" />
-    <state width="1877" height="386" key="GridCell.Tab.0.right/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607788420906" />
+    <state width="1877" height="386" key="GridCell.Tab.0.right/-1920.0.1920.1040/0.0.1920.1040@0.0.1920.1040" timestamp="1607871004781" />
     <state x="782" y="240" key="RollbackChangesDialog" timestamp="1607174263188">
       <screen x="0" y="0" width="1920" height="1040" />
     </state>