using System;

public static class Program

{

    static bool isPrime(int number){

         if ((number & 1) == 0)

            {

                if (number == 2)

                {

                    return true;

                }

                return false;

            }

            for (var i = 3; (i * i) <= number; i += 2)

            {

                if (number % i == 0)

                {

                    return false;

                }

            }

            return number != 1;

    }

    public static int sumValue=0;

    static int[,] matrix(this string input){

        var array1 = input.Split('\n');

        int[,] matrix1=new int[array1.Length, array1.Length + 1];

        for(int i=0;i<array1.Length;i++){

            var val= array1[i].Trim().Split(' ');

            for(int j=0; j<val.Length; j++){

                int arrayValue= Int32.Parse(val[j]);

                if(!isPrime(arrayValue)){

                    matrix1[i,j] = arrayValue;

                    sumValue++;

                }

                //Console.WriteLine(matrix1[i,j]);

            }

        }

        return matrix1;

    }

​

    public static void Main()

    {

        string input = @"   215

                            193 124

                            117 237 442

                            218 935 347 235

                            320 804 522 417 345

                            229 601 723 835 133 124

                            248 202 277 433 207 263 257

                            359 464 504 528 516 716 871 182

                            461 441 426 656 863 560 380 171 923

                            381 348 573 533 447 632 387 176 975 449

                            223 711 445 645 245 543 931 532 937 541 444

                            330 131 333 928 377 733 017 778 839 168 197 197

                            131 171 522 137 217 224 291 413 528 520 227 229 928

                            223 626 034 683 839 053 627 310 713 999 629 817 410 121

                            924 622 911 233 325 139 721 218 253 223 107 233 230 124 233";

        string input1= @"1               1

                         8 4

                         2 6 9

                         8 5 9 3";

        int[,] matrix1=matrix(input);

        int sum=0;

        for(int i = 13; i >= 0; i--){

            int max=0;

            for(int j = 0; j < 15; j++){

                //if(matrix1[i,j]>max)

                    //max = matrix1[i,j];

                matrix1[i,j] = Math.Max(matrix1[i, j] + matrix1[i+1, j], matrix1[i,j] + matrix1[i+1, j+1]);

            }

            sum=sum+max;

        }

        Console.WriteLine(matrix1[0,0]);

    }

}