#include <stdio.h>

int main() {
   int i[6];
   int d3 = 0,
       d7 = 0,
       d21 = 0;
   printf("Six integers: ");
   scanf("%d %d %d %d %d %d", i, i+1, i+2, i+3, i+4, i+5);
   for (int j = 0; j < 6; j++) {
      int each = i[j];
      if (each % 21 == 0) {
         d3++; d7++; d21++;
      }
      else if (each % 3 == 0) {
         d3++;
      }
      else if (each % 7 == 0) {
         d7++;
      }
   }
   printf("%d divisible by 3,\n%d divisible by 7,\n%d divisible by both.\n", d3, d7, d21);
   return 0;
}