using System;

using System.Linq;

using System.Collections.Generic;                   

public class Program

{

     public static int solution(int[] A) {

        int[] store = new int[A.Length];

         Console.WriteLine("A.Length " +A.Length);

        store[0] = A[0];

        for (int i = 1; i < A.Length; i++) {

            store[i] = store[i-1];

            for (int minus = 2; minus <= 6; minus++) {

                if (i >= minus) {

                    store[i] = Math.Max(store[i], store[i - minus]);

                } else {

                    break;

                }

            }

            store[i] += A[i];

        }

        return store[A.Length - 1];

    }

    public static void Main()

    {

        var r = Enumerable.Range(1, 5).ToArray();

        Console.WriteLine(solution(r));

        var data2 = new int[] {  1,-2,0,9,-1,-2 };

        Console.WriteLine(solution(data2));

        Console.WriteLine(solution(new int[] {-1, -2, -3, -4, -3, -8, -5, -2, -3, -4, -5, -6, -1}));

    }

}