#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];
      d3 += (each%3 == 0);
      d7 += (each%7 == 0);
      d21 += (each%21 == 0);
      /*
      if (each % 21 == 0) {
         d3++; d7++; d21++;
      }
      else if (each % 3 == 0) {
         d3++;
      }
      else if (each % 7 == 0) {
         d7++;
      }
      */
   }
   /*

   d7 = 6-(i[0]%7+i[1]%7+i[2]%7+i[3]%7+i[4]%7+i[5]%7);
   d21 = 6-(i[0]%21+i[1]%21+i[2]%21+i[3]%21+i[4]%21+i[5]%21);
   */
   printf("%d divisible by 3,\n%d divisible by 7,\n%d divisible by both.\n", d3, d7, d21);
   return 0;
}