// Level 3
#include <stdio.h>

int combi(int n, int r)
{
    int i, s = 1;
    for (i = n; i >= r + 1; i--) {
        s *= i;
    }
    for (i = n - r; i >= 2; i--) {
        s /= i;
    }
    return s;
}

int main()
{
    int n, r;

    for (n = 0; n <= 5; n++) {
        for (r = 0; r <= n; r++) {
            printf("%dC%d= %-3d", n, r, combi(n, r));
        }
        printf("\n");
    }
    return 0;
}