/*
 * Calculate factorials
 */

#include <stdio.h>

long factorial(long n){
    if (n == 1) {
        return(1);
    }
    return (n*factorial(n-1));
}

int main (void) {
    printf("%ld   %ld   %ld\n", factorial(6), factorial(8), factorial(10));
    return(0);
}