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 {
    let power = w as f64 / (d as f64).powf(2.0);
    power.floor() as u32
  }

  let mut w = works;
  for i in (2..=days).rev() {
    w = w - get_work(w, i);
  }

  w
}