fn main() {
    let n = read::<i64>();
    if n == 2 {
        println!("INF");
    } else if n <= 4 {
        println!("6");
    } else if n <= 6 {
        println!("4");
    } else {
        println!("2");
    }
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}