// yukicoder My Practice
// author: Leonardone @ NEETSDKASU
use std::io;

fn main() {
    let mut w_str = String::new();
    let mut d_str = String::new();
    
    io::stdin().read_line(&mut w_str).ok().expect("");
    io::stdin().read_line(&mut d_str).ok().expect("");
    
    let mut w : u64 = w_str.trim().parse().ok().expect("");
    let mut d : u64 = match d_str.trim().parse() {
        Ok(num) => num,
        Err(_) => return,
    };
    
    for _ in 1..d {
        let t : u64 = w / (d * d);
        w -= t;
        d -= 1;
    }
    
    println!("{}",w);
}