use proconio::{input, marker::Usize1};

fn main() {
    input! {
    a: i32,
    b: i32,
    c: i32,
    d: i32,
    }

    let h = 31 - a + b;
    let ans = if c <= h {
        1
    } else if d <= h {
        2
    } else {
        3
    };
    println!("{ans}");
}