import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        int n,m,cuts=0;
        Scanner sc=new Scanner(System.in);
        n=sc.nextInt();
        m=sc.nextInt();
        while(n!=1){
            cuts++;
            n--;
        }
        while(m!=1){
            cuts++;
            m--;
        }
        System.out.println(cuts);
    }
}