namespace _2.Jedi_Galaxy
{
    using System;
    using System.Linq;
    class Program
    {
        static void Main()
        {
            var dimensions = Console.ReadLine().Split().Select(int.Parse).ToArray();
            var matrixRows = dimensions[0];
            var matrixCols = dimensions[1];
            var galaxy = new long[matrixRows][];
            long stars = 0;
            for (int i = 0; i < galaxy.Length; i++)
            {
                galaxy[i]= new long[matrixCols];
                for (int j = 0; j < galaxy[i].Length; j++)
                {
                    galaxy[i][j] = stars;
                    stars++;
                }
            }
            var ivoCordinates = Console.ReadLine();
            int ivoRow = ivoCordinates[0];
            int ivoCol = ivoCordinates[1];
            long starsCollected = 0;
            var evilForces = Console.ReadLine();
            while (evilForces!= "Let the Force be with you" || ivoCordinates!= "Let the Force be with you")
            {
                var ivoTokens = ivoCordinates.Split().Select(int.Parse).ToArray();
                ivoRow = ivoTokens[0];
                ivoCol = ivoTokens[1];

                var evilForcesCord = evilForces.Split().Select(int.Parse).ToArray();
                var evilForcesRow = evilForcesCord[0];
                var evilForcesCol = evilForcesCord[1];

                EvilForcesContributeToGalaxy(galaxy, evilForcesRow, evilForcesCol, matrixRows,matrixCols);
                starsCollected= IvoCollectingStars(galaxy, ivoRow, ivoCol, matrixRows, matrixCols);
                ivoCordinates = Console.ReadLine();
                if (ivoCordinates == "Let the Force be with you")
                {
                    break;
                }
                evilForces = Console.ReadLine();
            }

            Console.WriteLine(starsCollected);
        }

        private static long IvoCollectingStars(long[][] galaxy, int ivoRow, int ivoCol, int matrixRows, int matrixCols)
        {
            long starsCollected = 0;
            while (ivoRow >= 0 && ivoCol < matrixCols)
            {
                if (IsInMatrix(matrixRows, ivoRow, ivoCol, matrixCols))
                {
                    starsCollected += galaxy[ivoRow][ivoCol];
                }
                ivoRow--;
                ivoCol++;
            }

            return starsCollected;
        }

        private static void EvilForcesContributeToGalaxy(long[][] galaxy, int evilForcesRow, int evilForcesCol, int rows , int cols )
        {

            while (evilForcesRow>=0 && evilForcesCol>=0)
            {
                if (IsInMatrix(rows,evilForcesRow,evilForcesCol,cols))
                {
                    galaxy[evilForcesRow][evilForcesCol] = 0;
                }
                evilForcesRow--;
                evilForcesCol--;
            }

        }
        public static bool IsInMatrix(int row, int testRow, int testCol, int columns)
        {
            if (testRow >= 0 && testRow < row && testCol >= 0 && testCol < columns)
            {
                return true;
            }
            else
            {
                return false;
            }
        }
    }
}