diff --git a/README.md b/README.md
index be139cf..047642d 100644
--- a/README.md
+++ b/README.md
@@ -36,3 +36,4 @@
 70 * 60 = 4200
 2 - 4 = -2
 60 * 8 = 480
+41 - 1 = 40