#include <bits/stdc++.h>
using namespace std;

using int64 = long long;
using i64 = int64;

#define rep(i,N) for(int i=0;i<(int)(N); ++i)

const int inf = 1 << 30;
const int64 inf64 = 1ll << 60;

double dp[301][301][301];

int main() {
   int x, y, z; cin >> x >> y >> z;

   int ans = min(x, y);
   int n= min(x, y);
   x -= n;
   y -= n;

   if(x > y) swap(x, y);


   if(y <= z) {
      ans += y;
      z -= y;
   } else {
      cout << ans + x << endl;
      return 0;
   }

   ans += z / 2;

   cout << ans << endl;
}