#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
   long long int x,y;
   long long int l,b;
    cin>>l>>b;
     x = (l-1) + (b-1)*l;
     y = (b-1) + (l-1)*b;
    if(x<=y)
        {
        
        cout<<y;
        
    }
   else 
       {
       cout<<x;
   }
    return 0;
}