//
//  main.cpp
//  101 Hack 42
//
//  Created by Albastroiu Radu on 10/18/16.
//  Copyright © 2016 Albastroiu Radu. All rights reserved.
//

#include <iostream>
#include <fstream>
#include <cstdio>
#include <algorithm>
#include <string>
#include <vector>
#include <string>
#include <deque>
#include <unordered_map>
#include <cstdint>

using namespace std;

long long n,i,j,m,x,c,count,nr,OK,suma,k, level , val, y, z;

int main()
{
    /*
     #ifndef ONLINE_JUDGE
     freopen("date.in","r",stdin);
     freopen("date.out","w",stdout);
     #endif
    */
    cin>>n>>m;
    x = 1; y = 1;
    i = max(x,n-1);
    j = max(y,m-1);
    cout << (n-1) + n*(m-1);
    
    return 0;
}