fn main() {
    let v: Vec<u64> = input_line();
    let (a, b) = (v[0], v[1]);

    println!("{}", (a | b) + (a & b));
}

#[allow(unused)]
fn input_line<T: std::str::FromStr>() -> Vec<T> {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}