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. */
        int n,m,ans;
        Scanner sc=new Scanner(System.in);
        
        n=sc.nextInt();
        m=sc.nextInt();
        if(n!=1&&m==1)
            ans=(n-1);
        else if(m!=1&&n==1)
            ans=(m-1);
            else if(n>m)
            ans=n+(n-1);
            else if(m>n)
            ans=m+(m-1);
            else if(n==m)
            ans=(n*n-1);
                        else
            ans=0;
            System.out.println(ans);
    }
}