diff --git a/cv3/program.c b/cv3/program.c
index 7541170..22876fb 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -11,7 +11,11 @@ int main() {
     int length = 0;
     double result = 0.0;
 
-    while (count < SIZE && scanf("%lf", &input) == 1) {
+     while (count < SIZE) {
+        if (scanf("%lf", &input) != 1) {
+            printf(":(");
+            break;
+        }
         coefs[count] = input;
         count++;
     }