fn main() {
    let mut w = input_line::<i64>()[0];
    let d = input_line::<i64>()[0];

    for i in 0..d - 1 {
        w -= w / ((d - i) * (d - i));
    }

    if w < 0 {
        w = 0;
    }
    println!("{}", w);
}
fn input_line<T: std::str::FromStr>() -> Vec<T> {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}