#![allow(non_snake_case)]

use std::io::{ self, prelude::* };

macro_rules! pick {
    ($tokens:expr) => {
        $tokens.next().unwrap().parse().expect("parse error")
    }
}

fn factorial_mod(n: u64, m: u64) -> u64 {
    if n <= 1 {
        1
    }
    else {
        n * factorial_mod(n-1,m) % m
    }
}

fn f(n: u64) -> String {
    if n >= 50 {
        "000000000000".to_owned()
    }
    else {
        let x = factorial_mod(n, 10_000_000_000_000);
        if x >= 1_000_000_000_000 {
            format!("{:012}", x % 1_000_000_000_000)
        }
        else {
            format!("{}", x)
        }
    }
}

fn main() {
    let mut s = String::new();
    io::stdin().read_to_string(&mut s).expect("i/o error");
    let mut tokens = s.split_whitespace();

    let N: u64 = pick!(tokens);

    let ans = f(N);

    println!("{}", ans);
}