diff --git a/cv3/program.c b/cv3/program.c
index 37fcc86..a8a5363 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -29,6 +29,10 @@ float getnpop(struct stack* stack)
 
 int calculate(struct stack* stack, char operator)
 {
+    if(stack->size < 2)
+    {
+        return 2;
+    }
     float num1 = getnpop(stack);
     float num2 = getnpop(stack);
     float res = 0;
@@ -108,6 +112,11 @@ int main(int argc, char const *argv[])
                 printf("division by zero\n");
                 return 0;
             }
+            else if(calculate(&calc_stack, buf[0]) == 2)
+            {
+                printf("not enough operands\n");
+                return 0;
+            }
         }
         for (int i = 0; i < calc_stack.size; i++)
         {