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

public class Solution {

    public static void main(String[] args) {
       Scanner in = new Scanner(System.in);
		int n = in.nextInt();
        int m = in.nextInt();
        int count = 0;
        if(n > 1)
            count = count + n-1;
        if(m > 1)
            count = count + m-1;
        System.out.println(count);
    }
}