fn main() {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let n: Vec<u32> = s
        .split_whitespace()
        .map(|x| x.parse::<u32>().unwrap())
        .collect();
    println!("{}", (n[0] | n[1]) + (n[0] & n[1]));
}