fn main() {
	let mut ab = String::new();
	std::io::stdin().read_line(&mut ab).ok();
	let mut ab: Vec<i64> = ab.trim().split_whitespace()
		.map(|e| e.parse().unwrap()).collect();
	let a = ab[0];
	let b = ab[1];
	let mut ans = 0i64;
	if a == b { ans = a + b; }
	else { ans = a + b + (a - b).abs() - 1; }
	println!("{}", ans);
}