factorial_function.cpp

#include<iostream>
using namespace std;
int fact(int n){
    int factorial = 1;
    for (int i = 2; i <= n; i++){
        factorial *= i;
    }
    return factorial;
}
int main(){
    int n;
    cin>>n;
    int ans = fact(n);
    cout<<ans<<endl;
    return 0;
}