[BOJ] 10872 팩토리얼(재귀).cpp

#include <iostream>
using namespace std;

int fact(int n) {
    if (n <= 1) return 1;
    
    return n * fact(n-1);
}

int main () {
    int N;
    cin >> N;
    
    cout << fact(N) << endl;
    
    return 0;
}