fn main() {
    let stdin = std::io::read_to_string(std::io::stdin()).unwrap();
    let mut stdin = stdin.split_ascii_whitespace();

    let d: u64 = stdin.next().unwrap().parse().unwrap();

    println!("{}", output(solve(d)));
}

fn solve(d: u64) -> (u64, u64) {
    let r = d * 108;
    (r / 100, r % 100)
}

fn output(ans: (u64, u64)) -> String {
    format!("{}.{:>02}", ans.0, ans.1)
}