diff --git a/2021/day1/day1.exa b/2021/day1/day1.exa
new file mode 100644
index 0000000..aac5a45
--- /dev/null
+++ b/2021/day1/day1.exa
@@ -0,0 +1,25 @@
+_XA
+grab 300
+
+mark process
+test f > x
+tjmp higher
+jump process
+
+mark higher
+seek -1
+copy f x
+copy 1 m
+jump process
+
+
+_XB
+mark recv
+copy m f
+noop
+noop
+noop
+noop
+test mrd
+tjmp recv
+halt