using System;
using System.Linq;
using System.Collections.Generic;
using System.Collections;

namespace Algorithm
{
    class Program
    {
        static void Main(string[] args)
        {
            var l = Console.ReadLine().Split().Select(int.Parse).ToArray();
            int X = l[0], Y = l[1], Z = l[2];

            foreach (var a in Enumerable.Range(1, Z))
            {
                if (X <= Y)
                    X++;
                else
                    Y++;

                Z--;
            }

            Console.WriteLine(Math.Min(X, Y));
        }
    }
}