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()
}

fn main() {
  let works: u32 = read();
  let days: u32 = read();
  println!("{}", no51(works, days))
}

fn no51(works: u32, days: u32) -> u32 {
  fn get_work(w: u32, d: u32) -> u32 {
    w / d.pow(2)
  }

  fn get_last_work(w: u32, d: u32) -> u32 {
    if d == 1 {
      w
    } else {
      get_last_work(w - get_work(w, d), d - 1)
    }
  }

  get_last_work(works, days)
}