Eh

#include <stdio.h>
#include <math.h>
int main()
{
    int k, a, b, z, d;

    printf("Enter K: \n");
    scanf("%d", &k);
    printf("Enter A: \n");
    scanf("%d", &a);
    printf("Enter B: \n");
    scanf("%d", &b);

    z = k*(a-b)*a;
    d = k % 3;
    printf("Source: \n", z);
    printf("Divided: \n", d);
    switch(d)
    {
        case 0:
            printf(z);
        case -1:
            printf(z-d);
        case -2:
            printf(z+d);
        default:
            printf("Error");
    }
return 0;
}