#include <stdio.h>

int mult(int x, int y) {
    int result = 0;
    for (int i = 0; i < y; i++) {
        result += x;
    }
    return result;
}

int fact(int n) {
    if (n == 0) {
        return 1;
    } else {
        return mult(n, fact(n - 1));
    }
}

int main() {
    for (int i = 0; i < 12; i++) {
        printf("fact(%d) = %d\n", i, fact(i));
    }
    return 0;
}