using System;

public class Program

{

    public static void Main()

    {

        int[,] myArray = new int[16, 16]{

            {104,   240,    147,    246,    123,    175,    372,    71,     116,    230,    260,    118,    202,    270,    277,    292}, 

            {740,   755,    135,    205,    429,    822,    844,    90,     828,    115,    440,    805,    526,     91,    519,    373}, 

            {1630,  991,    1471,   1294,    52,    1566,    50,    1508,   1367,   1489,    55,    547,    342,    512,    323,    51}, 

            {1356,  178,    1705,   119,    1609,   1409,   245,    292,    1434,   694,    405,    1692,   247,    193,    1482,   1407}, 

            {2235,  3321,   3647,   212,    1402,   3711,   3641,   1287,   2725,   692,    1235,   3100,   123,    144,    104,    101}, 

            {1306,  1224,   1238,   186,    751,    734,    1204,   1275,   366,    149,    1114,   166,    1118,   239,    153,    943}, 

            {132,   1547,   1564,   512,    2643,   2376,   2324,   2159,   1658,   107,    1604,   145,    2407,   131,    2073,   1878}, 

            {1845,   91,    1662,   108,    92,     1706,   1815,   1797,   1728,   1150,   1576,   83,     97,     547,    1267,   261}, 

            {78,    558,    419,    435,    565,    107,    638,    173,    93,     580,    338,    52,     633,    256,    377,    73}, 

            {1143,  3516,   4205,   3523,   148,    401,    3996,   3588,   300,    1117,   2915,   1649,   135,    134,    182,    267}, 

            {156,   2760,   1816,   2442,   2985,   990,    2598,   1273,   167,    821,    138,    141,    2761,   2399,   1330,   1276}, 

            {3746,  3979,   2989,   161,    4554,   156,    3359,   173,    3319,   192,    3707,   264,    762,    2672,   4423,   2924}, 

            {3098,  4309,   4971,   5439,   131,    171,    5544,   595,    154,    571,    4399,   4294,   160,    6201,   4329,   5244}, 

            {728,   249,    1728,   305,    2407,   239,    691,    2241,   2545,   1543,   55,     2303,   1020,   753,    193,    1638}, 

            {260,   352,    190,    877,    118,    77,     1065,   1105,   1085,   1032,   71,     87,     851,    56,     1161,   667}, 

            {1763,  464,    182,    1932,   1209,   640,    545,    931,    1979,   197,    1774,   174,    2074,   1800,   939,    161}

        };

        int checkSum = 0;

        for (int i = 0; i < 16; i++)

        {

            int lowest = 99999;

            int highest = 0;

            for (int j = 0; j < 16; j++)

            {

                if (myArray[i, j] < lowest)

                {

                    lowest = myArray[i, j];

                }

                if (myArray[i, j] > highest)

                {

                    highest = myArray[i, j];

                }

            }

            checkSum += highest - lowest;

        }

        Console.WriteLine("Checksum = {0}", checkSum);

    }

}