fn main() {
    let mut ab = String::new();
    std::io::stdin().read_line(&mut ab).ok();
    let ab: Vec<usize> = ab.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let a = ab[0];
    let b = ab[1];

    if a == b {
        println!("{}", a*2);
        return;
    }
    println!("{}", (a+b-a.min(b))*2 - 1);
}