fn main() {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let v: Vec<i32> = s.trim().split_whitespace().map(|e| e.parse::<i32>().unwrap()).collect();

    let _ = v[0];
    let _ = v[1];
    let c = v[2];
    let d = v[3];

    let ans = d / (1 + c);

    println!("{}", ans);
}