use std::io::*;
use std::str::FromStr;

fn main() {
    exec(read());
}

fn exec(i: i64) {
    if i >= 50 {
        println!("000000000000");
    } else if i >= 15 {
        let rem = get_fact(i);
        println!("{:>012}", rem);
    } else {
        let rem = get_fact(i);
        println!("{}", rem);
    }
}

fn get_fact(i: i64) -> i64 {
    const MOD: i64 = 1_000_000_000_000;

    let fact_i = recurse(i, &|n, fact| {
        if n <= 1 {
            1_i64
        } else {
            n * fact(n - 1) % MOD
        }
    });
    fact_i
}

fn recurse<X, Y>(x: X, f: &dyn Fn(X, &dyn Fn(X) -> Y) -> Y) -> Y {
    f(x, &|x: X| recurse(x, &f))
}

fn read<T: FromStr>() -> T {
    let stdin = stdin();
    let stdin = stdin.lock();
    let token: String = stdin
        .bytes()
        .map(|c| c.expect("failed to read char") as char)
        .skip_while(|c| c.is_whitespace())
        .take_while(|c| !c.is_whitespace())
        .collect();
    token.parse().ok().expect("failed to parse token")
}