import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        int X = sc.nextInt();
        int Y = sc.nextInt();
        int Z = sc.nextInt();
        int ZZ = Z;
        int ans = 0;
        for(int i=0;i<Z;i++)
        {
            if(X>Y)
            {
                Y++;
            }
            else if(X<=Y)
            {
                X++;
            }
            ZZ--;
        }
        if(X>Y)
        {
            ans = Y;
        }
        else
        {
            ans = X;
        }
        System.out.println(ans);
    }
}