import java.util.Scanner;

public class Main {
    public static void main(String args[]){
        Scanner stdIn = new Scanner(System.in);
        int x = stdIn.nextInt();
        int y = stdIn.nextInt();
        int z = stdIn.nextInt();
        
        for(int i = z; i > 0; i--){
            if(x >= y){
                y++;
            }else{
                x++;
            }
        }
        
        System.out.println(Math.min(x, y));
    }
}