diff --git a/cv3/program.c b/cv3/program.c
index 5c21ecc..0ff6571 100644
--- a/cv3/program.c
+++ b/cv3/program.c
@@ -3,7 +3,7 @@
 #include <string.h>
 #include <ctype.h>
 #include <assert.h>
-#define STACK_SIZE 50
+#define STACK_SIZE 10
 
 struct stack
 {
@@ -11,11 +11,16 @@ struct stack
    int size;
 };
 
-void add(struct stack* stack, float num)
+int add(struct stack* stack, float num)
 {
+    if(stack->size == STACK_SIZE)
+    {
+        return 1;
+    }
     assert(stack->size < STACK_SIZE);
     stack->values[stack->size] = num;
     stack->size++;
+    return 0;
 }
 
 float getnpop(struct stack* stack)
@@ -103,7 +108,12 @@ int main(int argc, char const *argv[])
         if(!check_op(buf[0]))
         {
             num = atof(buf);
-            add(&calc_stack, num);
+            int add_code = add(&calc_stack, num);
+            if(add_code == 1)
+            {
+                printf("full stack\n");
+                return 0;
+            }
         }
         else
         {