Fun with Matrices

using System;
class FunwithMatrices
{
    static void Main()
    {
        double startNumber = double.Parse(Console.ReadLine());
        double step = double.Parse(Console.ReadLine());
        double[,] matrix = new double[4, 4];
        for (int r = 0; r< 4; r++)
        {
            for (int c = 0; c < 4; c++)
            {
                matrix[r, c] = startNumber;
                startNumber = startNumber + step;
            }
        }
        bool gameOver = true;
        while (gameOver)
        {
            string[] commandAsString = Console.ReadLine().Split(' ');
            if (commandAsString[0] != "Game")
            {
                int row = int.Parse(commandAsString[0]);
                int col = int.Parse(commandAsString[1]);
                double num = double.Parse(commandAsString[3]);
                switch (commandAsString[2])
                {
                    case "multiply": matrix[row, col] *= num; break;
                    case "sum": matrix[row, col] += num; break;
                    case "power": matrix[row, col] = Math.Pow(matrix[row, col], num); ; break;
                }
            }
            else
            {
                gameOver = false;
            }
        }
         //check the bigest sum
        double sumZeroRow = matrix[0, 0] + matrix[0, 1] + matrix[0, 2] + matrix[0, 3];
        double sumFirstRow= matrix[1, 0] + matrix[1, 1] + matrix[1, 2] + matrix[1, 3];
        double sumSeconddRow = matrix[2, 0] + matrix[2, 1] + matrix[2, 2] + matrix[2, 3];
        double sumThirdRow = matrix[3, 0] + matrix[3, 1] + matrix[3, 2] + matrix[3, 3];
        double sumZeroCol = matrix[0, 0] + matrix[1, 0] + matrix[2, 0] + matrix[3, 0];
        double sumFirstCol = matrix[0, 1] + matrix[1, 1] + matrix[2, 1] + matrix[3, 1];
        double sumSeconddCol = matrix[0, 2] + matrix[1, 2] + matrix[2, 2] + matrix[3, 2];
        double sumThirdCol = matrix[0, 3] + matrix[1, 3] + matrix[2, 3] + matrix[3, 3];
        double leftDiagonal = matrix[0, 0] + matrix[1, 1] + matrix[2, 2] + matrix[3, 3];
        double rightDiagonal = matrix[0, 3] + matrix[1, 2] + matrix[2, 1] + matrix[3, 0];
        double[] matrixSum = { sumZeroRow, sumFirstRow, sumSeconddRow, sumThirdRow, sumZeroCol, sumFirstCol, sumSeconddCol, sumThirdCol, leftDiagonal, rightDiagonal };
        double largestSum = 0;
        string element="";
        int index=0;
        for (int i = 0; i < 4; i++)
        {
            if (matrixSum[i]>largestSum)
            {
                largestSum = matrixSum[i];
                element = "ROW";
                index = i;
            }
        }
        for (int i = 4; i < 8; i++)
        {
            if (matrixSum[i] > largestSum)
            {
                largestSum = matrixSum[i]; 
                element = "COLUMN";
                index = i-4;
            }
        }
        if (matrixSum[8] > largestSum)
        {
            largestSum = matrixSum[8]; 
            element = "LEFT-DIAGONAL";
        }
        if (matrixSum[9] > largestSum)
        {
            largestSum = matrixSum[9]; 
            element = "RIGHT-DIAGONAL";
        }
        if (element == "RIGHT-DIAGONAL" || element == "LEFT-DIAGONAL")
        {
            Console.WriteLine(element+" = " +"{0:0.00}", largestSum);
        }
        else
        {
            Console.WriteLine(element + "["+index+ "] = "+ "{0:0.00}", largestSum);
        }
    }
}