fn main() {
    let mut line = String::new();
    std::io::stdin().read_line(&mut line);
    let (mut n, mut k) = (-1, -1);
    for (i, x) in line.split_whitespace().enumerate() {
        let v = x.parse::<i64>().unwrap();
        match i {
            0 => n = v,
            1 => k = v,
            _ => (),
        }
    }
    println!("{}", n / (k + 1) + 1);
}