#include <iostream>
#include <cstdlib>
#include <algorithm>

using namespace std;
typedef long long ll;

int main()
{
    long long n;
    cin>>n;
    if(n>=1e5)cout<<0<<endl,exit(0);
    long long res=1;
    for(int i=1;i<=n;i++){
        res=(res*i)%((long long)1e12);
    }
    cout<<res<<endl;
    return 0;
}