1. #include<stdio.h>
  2. int main()
  3. {
  4.     int n1,n2 = 0;
  5.     scanf("%d %d", &n1, &n2);
  6.     int i = 0;
  7.     int sum = 0;
  8.     int count = 0;
  9.     for (i = n1; i <= n2; i++)
  10.     {
  11.         sum = 0;
  12.         int k = i;
  13.         while (k)
  14.         {
  15.             sum += k % 10;
  16.             k /= 10;
  17.         }
  18.         if (sum % 5 == 0)
  19.         {
  20.             count++;
  21.         }
  22.     }
  23.     printf("%d\n", count);
  24.     return 0;
  25. }