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diff --git a/archive/1.vm/factorial.mu b/archive/1.vm/factorial.mu
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+# example program: compute the factorial of 5
+
+def main [
+  local-scope
+  x:num <- factorial 5
+  $print [result: ], x, [ 
+]
+]
+
+def factorial n:num -> result:num [
+  local-scope
+  load-inputs
+  {
+    # if n=0 return 1
+    zero?:bool <- equal n, 0
+    break-unless zero?
+    return 1
+  }
+  # return n * factorial(n-1)
+  x:num <- subtract n, 1
+  subresult:num <- factorial x
+  result <- multiply subresult, n
+]
+
+# unit test
+scenario factorial-test [
+  run [
+    1:num <- factorial 5
+  ]
+  memory-should-contain [
+    1 <- 120
+  ]
+]