#include<bits/stdc++.h>
using namespace std;

int main(){
    int n;
    cin >> n;
    long long answer = 1;
    long long base = 1000000000000;
    bool flag = false;

    int counter = 1;
    while(counter <= n){
        answer *= counter;
        if( answer /base > 0){
            flag = true;
            answer %= base;
        }
        counter++;
        if( answer == 0){
            cout << "000000000000" << endl;
            return 0;
        }
    }
    if(flag){
        printf("%012lld\n",answer);
    }
    else{
        cout << answer << endl;
    }
    
}