diff --git a/flap/questions/retrolixToX86_64/07.retrolix b/flap/questions/retrolixToX86_64/07.retrolix
index e69de29..b653317 100644
--- a/flap/questions/retrolixToX86_64/07.retrolix
+++ b/flap/questions/retrolixToX86_64/07.retrolix
@@ -0,0 +1,27 @@
+
+def fact ()
+  local x:
+    jumpif lte %rdi, 1 -> fini, rec;
+
+    fini:
+    %rax <- copy 1;
+    ret;
+
+    rec:
+    x <- copy %rdi;
+    %rdi <- sub %rdi, 1;
+    fact();
+    %rax <- mul %rax, x;
+    ret;
+end
+
+globals (x)
+  x <- copy 5;
+
+  %rdi <- copy x;
+  fact();
+  x <- copy %rax;
+
+  %rdi <- copy x;
+  observe_int();
+end