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


int main() {
      unsigned long long int  n,m,ans = 0;
    cin >> n >> m;
      unsigned long long int  ans0 = 0, ans1 = 0;
  //  if(n == 1)
    //        n++;
    //if(m == 1)
      //      m++;
    ans0 = n-1 + ((n)*(m-1));
    ans1 = m-1 + ((n-1) * (m));
    unsigned long long int ct= min(((m-1)+(m*(n-1))), ((n-1)+(n*(m-1))));
                cout << ct;
    return 0;
}