public static void Main()
{
string[] args = Console.ReadLine()
.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
ArrayParser parser = new ArrayParser();
int[] dimensions = parser.IntegersParser(args);
int rows = dimensions[0];
int cols = dimensions[1];
MatrixGenerator matrixGenerator = new MatrixGenerator();
MatrixOperator matrixOperator = new MatrixOperator();
int[,] matrix = matrixGenerator.GenerateIntegersMatrix(rows, cols);
string command = null;
long sum = 0;
while ((command = Console.ReadLine()) != "Let the Force be with you")
{
string[] ivoArgs = command.Split();
int[] ivoCoordinates = parser.IntegersParser(ivoArgs);
string[] evilArgs = Console.ReadLine().Split();
int[] evilCoordinates = parser.IntegersParser(evilArgs);
int evilRow = evilCoordinates[0];
int evilCol = evilCoordinates[1];
matrixOperator.DeleteElementsFromBottomRightToUpperLeft(matrix, evilRow, evilCol);
int ivoRow = ivoCoordinates[0];
int ivoCol = ivoCoordinates[1];
sum += matrixOperator.SumElementsFromBottomLeftToUpperRight(matrix, ivoRow, ivoCol);
}
Console.WriteLine(sum);
}