import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner input=new Scanner(System.in);
        int a1=input.nextInt();
        int a2=input.nextInt();
        if(a1==1 && a2==1) System.out.println(0);
        else if(a1==1 ) System.out.println(""+(a2-1));
            else if(a2==1) System.out.println(""+(a1-1));
            else
             System.out.println(""+((a1-1)+(a2-1)));
    }
}