diff --git a/src/main/c/Calculator/calculator.c b/src/main/c/Calculator/calculator.c
index b130f30..e29d35c 100644
--- a/src/main/c/Calculator/calculator.c
+++ b/src/main/c/Calculator/calculator.c
@@ -107,6 +107,12 @@ int main() {
                 scanf("%lf", &angle);
                 result = tangent(angle);
                 printf("Tangent of %.2lf degrees: %lf\n", angle, result);
+                break;
+                 case 14:
+                printf("Enter n and r: ");
+                scanf("%d %d", &n, &r);
+                result = permutation(n, r);
+                printf("Permutation of %d and %d: %lf\n", n, r, result);
                 break;
                 case :
                 printf("Exiting...\n");