diff --git a/06/solution.zsh b/06/solution.zsh
new file mode 100755
index 0000000..7cde1d5
--- /dev/null
+++ b/06/solution.zsh
@@ -0,0 +1,9 @@
+#!/usr/bin/zsh
+typeset -A F; for i ({0..9}) F+=($i 0)
+for v (${(@s.,.)$(<input.txt)}) ((F[$v]++))
+calc() {
+    for ((i=$2;i<=$3;i++)) ((F[$[(i+7)%9]]+=$F[$[i%9]]))
+    print Solution $1: $((${(j:+:)F}))
+}
+calc 1 1 79
+calc 2 80 255