use proconio::{fastout, input};

#[fastout]
fn main() {
    input! {
        points: [u8; 2],
    }

    println!("{}", output(solve(points)));
}

fn solve(points: Vec<u8>) -> u8 {
    (0..12)
        .filter(|&x| x & 3 == points[0] & 3 && !points.contains(&x))
        .next()
        .unwrap()
}

fn output(ans: u8) -> u8 {
    ans
}