import java.util.*;

class Main
{
    public static void main(String[] args)
    {
        Scanner sc = new Scanner(System.in);
        
        int a = sc.nextInt();
        int b = sc.nextInt();
        
        int max = 0;
        int aa = a + (a - 1);
        int bb = b + (b - 1);
        int ab = a + b;
        
        if (max <= aa) {
            max = aa;
        }
        if (max <= bb) {
            max = bb;
        }
        if (max <= ab) {
            max = ab;
        }
        
        System.out.println(max);
        
    }
}
/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