#include <stdio.h>

int main()
{
  int amount, cost;
  int result = 10;
  printf("please enter amount and cost\n");
  scanf("%d %d", &amount, &cost);

  printf("entered values: amount = %d, cost = %d\n", amount, cost);
  if (amount == 13)
  {
    if (cost == 52)
    {
      result = 20; 
    }
    else
    {
      result = 30;
    }
  }

  printf("result = %d\n", result);
}