#include <bits/stdc++.h>
#include <time.h>

using namespace std;
using LL = long long;

const int MOD = 998244353;

class Edge{
public:
    LL from,to, value;
    Edge(int f,int t, int c){
        from = f;
        to = t;
        value = c;
    }
};

int main(){
    int X,Y,Z;cin >> X >> Y >> Z;
    for(int i = 0;i < Z;i++){
        if(X < Y){
            X++;
        }else{
            Y++;
        }
    }
    cout<<min(X,Y)<<endl;
}