use std::cmp::{max, min};
use std::collections::{HashMap, HashSet, VecDeque};
use std::io::{stdin, stdout, BufWriter};

fn main() {
    let mut scan = Scanner::default();
    let a = scan.next::<usize>();
    let b = scan.next::<usize>();

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

#[derive(Default)]
struct Scanner {
    buffer: Vec<String>,
}
impl Scanner {
    fn next<T: std::str::FromStr>(&mut self) -> T {
        loop {
            if let Some(token) = self.buffer.pop() {
                return token.parse().ok().expect("Failed parse");
            }
            let mut input = String::new();
            stdin().read_line(&mut input).expect("Failed read");
            self.buffer = input.split_whitespace().rev().map(String::from).collect();
        }
    }
}