#include <bits/stdc++.h>
using namespace std;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}
using Int = long long;
const char newl = '\n';

//INSERT ABOVE HERE
signed main(){
  cin.tie(0);
  ios::sync_with_stdio(0);

  int x,y,z;
  cin>>x>>y>>z;
  int ans=min(x,y);
  x-=ans;
  y-=ans;

  int tmp=min(x+y,z);
  ans+=tmp;
  z-=tmp;
  ans+=z/2;

  cout<<ans<<endl;
  return 0;
}