diff --git a/README.md b/README.md
index 5fde1e1..fb9a8f1 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 33 - 19 = 14
 74 - 40 = 34
 44 * 58 = 2552
+4 - 68 = -64