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 m = n * 100 + n * 8; println!("{}.{:>02}", m / 100, m % 100); }