use proconio::input;

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

    let t = 31 - a + b;

    let ans = if c <= t {
        1
    } else if d <= t {
        2
    } else {
        3
    };

	println!("{ans}");
}