#include <bits/stdc++.h>
using namespace std;
int main(void){
    long long n;
    cin>>n;
    int flag=0;
    long long now=1;
    for(long long i=1;i<=n;i++){
        now*=i;
        if(now>=1e12){
            flag=1;
            now%=(long long)1e12;
        }
        if(now==0)break;
    }
    string s=to_string(now);
    if(flag){
        while(s.size()!=12)s="0"+s;
    }
    cout<<s<<endl;
    return 0;
}