#include<bits/stdc++.h>
#define lo long long
using namespace std;
int main() {
   lo n,m;
   cin>>n>>m;
   lo temp1,temp2;
   temp1 = n-1 + (m-1)*n;
   temp2 = m-1 + m*(n-1);
   cout<<min(temp1,temp2)<<endl;
   return 0;

}