diff --git a/README.md b/README.md
index b3b409b..35346f6 100644
--- a/README.md
+++ b/README.md
@@ -41,3 +41,4 @@
 53 - 2 = 51
 62 * 61 = 3782
 77 * 45 = 3465
+91 - 52 = 39