fact recurse

#include <iostream>
#include <string>

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;
}