import java.util.*;

public class Main
{
	public static void main(String[] args)
	{
		Scanner stdIn = new Scanner(System.in);
		int a,b,sum=0;
		a = stdIn.nextInt();
		b = stdIn.nextInt();
		
		int A = Math.max(a,b);
		int B = Math.min(a,b);
		
		sum = Math.max(2*A-1,A+B);
		
		System.out.println(sum);
	}
}
/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