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

public class Solution {
    public static void main(String[] args) {
        PrintWriter output = new PrintWriter(System.out);
        new Solution().processInput(new Scanner(System.in), output);
        output.flush();
    }

    public void processInput(Scanner in, PrintWriter output) {
        long n = in.nextInt(); //
        long m = in.nextInt();

        long nCuts = n - 1;
        long mCuts = (m - 1) * n;
        long x = nCuts + mCuts;
        mCuts = m - 1;
        nCuts = (n - 1) * m;
        long y = nCuts + mCuts;
        output.println(Math.min(x,y));

    }

}