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

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