#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios::sync_with_stdio(false); cin.tie(0);
  int x, y, z;
  cin >> x >> y >> z;
  while (z) {
    if (x <= y) x++;
    else y++;
    z--;
  }
  cout << min(x, y) << '\n';
  return 0;
}