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

int A, B, ans;

int main() {
  cin >> A >> B;
  ans = 2 * A + 2 * B - 2 * min(A, B) - 1;
  cout << ans << endl;
  return 0;
}