const DIVISOR: u64 = 10u64.pow(12);

fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: u64 = n.trim().parse().unwrap();

    if n >= 50 {
        println!("{}", "0".repeat(12));
    } else {
        let mut answer = 1;
        let mut over = false;
        for i in 1..=n {
            answer *= i;
            if answer >= DIVISOR {
                over = true;
                answer %= DIVISOR;
            }
        }

        let answer = answer.to_string();

        if over {
            println!("{}{}", "0".repeat(12 - answer.len()), answer);
        } else {
            println!("{}", answer);
        }
    }
}