Added Problem 64

Mansi1233 · Mansi1233 · commit 84889a877206 · 2020-05-28T22:06:11.000+05:30
diff --git a/README.md b/README.md
@@ -63,7 +63,7 @@
       input : 1 , Output : 1
       input : 2 , Output : 0 
       input : 3 , Output : 0
-      nput : 4 , Output : 0
+      input : 4 , Output : 0
       input : 5 , Output : 1728 (it took 23 seconds) 
 ```
 
