#include <stdio.h>

int is_multiple(int a, int b)
{
  int result;
  if (a % b == 0)
  {
    result = 1;
  }
  else
  {
    result = 0;
  }

  return result;
}


int count_multiples(int a, int b, int x)
{
  int result = 0;
  int i, check;

  for (i = a; i <= b; i++)
  {
    check = is_multiple(i, x);
    if (check == 1)
    {
      result = result + 1;
    }
  }

  return result;
}


int main()
{
  int a, b;
  int result;

  printf("please enter two integers A and B:\n");
  scanf("%d %d", &a, &b);

  if ((a > 0) && (b > 0))
  {
    result = count_multiples(a, b, 7);
    printf("There are %d multiples of 7 between %d and %d\n", result, a, b);
  }

}