import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		ArrayList<Integer> arrayList = new ArrayList<Integer>();
		arrayList.add(calculation(A));
		arrayList.add(calculation(B));
		arrayList.add(A+B);
		System.out.println(Collections.max(arrayList));
	}
	
	private static int calculation(int input) {
		return input + (input-1);
	}
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz