#include <bits/stdc++.h>
using namespace std;
int main(){
  int A, B;
  cin >> A >> B;
  long long ans = (long long) (A + B) * 2;
  if (A < B){
    swap(A, B);
  }
  if (A == B){
    ans -= B * 2 - 1;
  } else {
    ans -= B * 2;
  }
  ans--;
  cout << ans << endl;
}