import java.util.Scanner;
public class Main {

    public static void main(String[] args) {
        Scanner Ent = new Scanner(System.in);
        int a = Ent.nextInt();
        int b = Ent.nextInt();
        int suma1 = 2*a - 1;
        int suma2 = 2*b - 1;
        int suma3 = a + b;
        System.out.println(Math.max(suma1, Math.max(suma2, suma3)));
    }
}

/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