#include <bits/stdc++.h>
using namespace std;
long long a, b, c, ans;
int main() {
  cin >> a >> b >> c;
  long long pom = min(a, b);
  a -= pom;
  b -= pom;
  ans = c + pom;
  ans <<= 1;
  if (a or b) ans++;
  cout << ans;
}
