#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;

ll A, B, ans;

int main() {
  cin >> A >> B;
  if (abs(A - B) > 0) ans = A + B + abs(A - B) - 1;
  else ans = A + B;
  cout << ans << endl;
  return 0;
}