import java.util.*;

public class Main {
  public static void main(String[] args) throws Exception{
    
    Scanner sc = new Scanner(System.in);
    
    int A = sc.nextInt();
    int B = sc.nextInt();
    
    int x = 2 * A -1;
    int y = 2 * B -1;
    int z = A + B;
    
    System.out.println(Math.max(z,Math.max(x,y)));
  }
}
/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