fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let crims: usize  = 99 * n;
    let ncrims: usize = 10000 - n;
    println!("{}", (ncrims as f64) * 100.0 / ((crims + ncrims) as f64));
}