use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let n: u64 = itr.next().unwrap().parse().unwrap();
    let mut ans = 1;
    if n < 50 {
        for i in 1..n + 1 {
            ans = (ans * i) % 1000000000000;
        }
    } else {
        ans = 0;
    }
    println!("{:<012}", ans);
}