use proconio::input;

fn main() {
    input! {
        (a, b, c, d): (usize, usize, usize, usize),
    }

    let cap = 31 - a + b;
    let ans = if cap >= c {
        1
    } else if cap >= d {
        2
    } else {
        3
    };

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