#include <stdio.h>

int Factorial(int n) {
        if (n == 0) {
                return 1;
        } else {
                return (n * Factorial(n-1));
        }
}

int main(int argc, char **argv) {
        int a = 5;
        printf("%d factorial: %d\n", a, Factorial(a));
        return 0;
}