求 n!

#include <bits/stdc++.h>

using namespace std;

int display(int n)
{
    
    
    int sum;
    if(n == 1)
    sum = 1;
    else
    sum = display(n - 1) * n;
    return sum;
}
int main()
{
    
    
    int n;
    cin>>n;
    cout<<display(n);
    return 0;
}