#include <iostream>
using namespace std;
int factorial(int n){
if (n<0){
return -1;
}else{
int result = 1;
for(int i=1;i<=n;i++){
result *= i;
}
return result;
}
}
int main() {
//Q1. Create a different 'int factorial(int n)', one that does NOT use recursion.
cout << factorial(6) << endl;
}