fn main() {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let v: Vec<i32> = s.trim().split_whitespace()
		.map(|e| e.parse().ok().unwrap()).collect();
	let ans = match (v[0] < v[1], v[0] > v[1]) {
		(true, _) => v[0] * 2,
		(_, true) => v[1] * 2,
		(_, _) => v[0] * 2 - 1,
	};
	println!("{}", ans);
}