#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <queue>
#include <cmath>
#include <climits>
#include <iomanip>
#include <set>
#include <map>
using namespace std;
typedef long long ll;
int main(){
    ll x,y,z;
    cin >> x >> y >> z;
    while(z > 0) {
        if(x >= y)y++;
        else x++;
        z--;
    }
    cout << min(x,y) << endl;
}