import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		Scanner scanner = new Scanner(System.in);
		
		String input = scanner.nextLine();

		scanner.close();
		
		String[] inputs = input.split(" ", 0);
		
		String inAStr = inputs[0];
		String inBStr = inputs[1];
		
		Integer inA = Integer.parseInt(inAStr);
		Integer inB = Integer.parseInt(inBStr);
		
		Integer valAA = inA + inA - 1;
		Integer valAB = inA + inB;
		Integer valBB = inB + inB - 1;
		
		Integer max = valAA < valAB ? valAB : valAA;
		Integer max2 = max < valBB ? valBB : max;
		
		System.out.println(max2);
	}
}

/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