diff --git a/README.md b/README.md
index 4d388a5..722af5f 100644
--- a/README.md
+++ b/README.md
@@ -29,3 +29,4 @@
 33 * 25 = 825
 29 - 15 = 14
 99 * 85 = 8415
+90 - 36 = 54