use proconio::input;
fn main() {
  input!{
    n: usize
  }

  let mut multiplier = 1;
  loop {
    let current = n*multiplier;
    if current<1_000_000_000{multiplier += 10; continue;}
    if current % n == 0 { println!("{}", current); return;}
    multiplier += 10;
  }
}