import java.util.Scanner;

public class Main {
	public static void main(String[] args) {

		Scanner reader = new Scanner(System.in);
		int A = reader.nextInt();
		int B = reader.nextInt();
		int ans = Math.max(A+A-1, B+B-1);
		ans = Math.max(ans, A+B);


		System.out.print(ans);
		reader.close();

	}

}




/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