#include <stdio.h>

int main(void) {
    int a=-1,  b=7; 
    for (int k = 0; k < 3; ++k)
      printf("%d = %d, %d = %d\n", (a+k*b)/b, (a/b)+k, (-a)/b, -(a/b));
    printf("%d, %d\n", a % b, (b + (a % b)) % b);
}