import java.util.*;

class Main
{
	public static void main(String[] args) {
	    Scanner sc = new Scanner(System.in);
	    
	    int a = Integer.parseInt(sc.next());
	    int b = Integer.parseInt(sc.next());
	    
	    int sum_1 = a + a - 1;
	    int sum_2 = b + b - 1;
	    int sum_3 = a + b;
	    
	    int ans = Math.max(sum_1, Math.max(sum_2, sum_3));
	    
	    System.out.println(ans);
	}
}

/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