#include <bits/stdc++.h>
 
#define rep(i, n)      for (int i = 0; i < (n); i++)
#define repr(i, n)     for (int i = (n) - 1; i >= 0; i--)
#define repe(i, l, r)  for (int i = (l); i < (r); i++)
#define reper(i, l, r) for (int i = (r) - 1; i >= (l); i--)
#define repi(i, l, r)  for (int i = (l); i <= (r); i++)
#define repir(i, l, r) for (int i = (r); i >= (l); i--)
#define range(a) a.begin(), a.end()
void init_io() { std::cin.tie(nullptr); std::ios::sync_with_stdio(false); std::cout << std::fixed << std::setprecision(15); }
 
using namespace std;
using ll = long long;

int main() { init_io();
  int x, y, z; cin >> x >> y >> z;
  int ans = 0;
  for (int i = 0; i <= z; i++) {
    int j = z - i;
    ans = max(ans, min(x + i, y + j));
  }
  cout << ans << endl;
}