using System;

namespace test
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] ratings = { -1, -2, -3, -4, -5 };

            Console.WriteLine(maximizeRatings(ratings));
        }


        static int maximizeRatings(int[] ratings)
        {
            int i = 2;
            int[] answers = new int[ratings.Length];
            if (ratings.Length == 0)
                return 0;


            answers[0] = ratings[0];
            answers[1] = Math.Max(ratings[1], ratings[1] + answers[0]);
            for (; i < ratings.Length; i++)
            {
                answers[i] = Math.Max(answers[i - 1], answers[i - 2]) + ratings[i];
            }
            return Math.Max(answers[i - 2], answers[i-1]);
        }
    }
}