#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <iomanip>
#include <algorithm>
#include <map>
#include <stack>
#include <queue> 
#include <list>
#include <utility>
#include <fstream>
#include <cstring>
#include <cstdio> 

#define lli long long int
#define M 1000000007 

using namespace std;

lli arrn[200001], arrm[200001], chk[200001] ;

map <lli, vector<int> > mp ; 

int main()
{

	lli n, m, cc = 0  ;
	
	cin >> n >> m ; 

    lli a = n - 1 + n * (m - 1) ;
    
    lli b = m - 1 + m * (n - 1) ;
    
    if(a<b)
        cout << a ;
    else
        cout << b ; 
    
    
}