using System;

using System.Collections.Generic;

using System.Linq;

​

namespace EulerProject18

{

    public class Program

    {

        static string dataAsText = @"75

95 64

17 47 82

18 35 87 10

20 04 82 47 65

19 01 23 75 03 34

88 02 77 73 07 63 67

99 65 04 28 06 16 70 92

41 41 26 56 83 40 80 70 33

41 48 72 33 47 32 37 16 94 29

53 71 44 65 25 43 91 52 97 51 14

70 11 33 28 77 73 17 78 39 68 17 57

91 71 52 38 17 14 91 43 58 50 27 29 48

63 66 04 68 89 53 67 30 73 16 69 87 40 31

04 62 98 27 23 09 70 98 73 93 38 53 60 04 23";

        public static List<List<int>> ConvertToLists(string data)

        {

            return data.Replace("\r", "").Split('\n').Select(x =>x.Split(' ').Select(int.Parse).ToList()).ToList();

        }

​

        public static int MaxPath(List<List<int>> data)

        {

            for (int i = 1; i < data.Count; i++)

            {

                for (int j = 0; j < data[i].Count; j++)

                {

                    if (j == 0)

                    {

                        data[i][j] += data[i - 1][j];

                    }

                    else if (j == data[i].Count - 1)

                    {

                        data[i][j] += data[i - 1][j - 1];

                    }

                    else

                    {

                        data[i][j] += Math.Max(data[i - 1][j - 1], data[i - 1][j]);

                    }

                }

            }

​

            return data[data.Count - 1].Max();

        }

​

        public static void Main(string[] args)

        {

            var data = ConvertToLists(dataAsText);

​

            var max = MaxPath(data);

            Console.WriteLine(max);

        }

    }

}