using System;
using System.Linq;
public class Colecting
{
    static void Main()
    {
        string galaxyData = Console.ReadLine();
        int[] dimestions = galaxyData
            .Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries)
            .Select(int.Parse)
            .ToArray();

        int row = dimestions[0];
        int col = dimestions[1];

        Space galaxy = new Space(dimestions[0], dimestions[1]);

        Console.WriteLine(ColectingHearths(galaxy));
    }

    private static string ColectingHearths(Space galaxy)
    {
        string loverData;
        long sum = 0L;

        Coordinates coordinates = new Coordinates();
        Evil evil = new Evil();
        Lover ivo = new Lover(sum);

        while ((loverData = Console.ReadLine()) != "Let the Force be with you")
        {
            evil = new Evil(new Coordinates(Console.ReadLine()));
            evil.RemoveStars(galaxy.Matrix);

            ivo = new Lover(new Coordinates(loverData));
            ivo.ColectingStars(galaxy.Matrix, ivo.StarsColected);
        }
        return ivo.StarsColected.ToString();
    }
}

using System;
using System.Collections.Generic;
using System.Text;

public class Space
{
    int[,] matrix;

    public int[,] Matrix { get => matrix; set => matrix = value; }

    public Space(int rowCount, int colCount)
    {
        int value = 0;

        matrix = new int[rowCount, colCount];

        for (int rowIndex = 0; rowIndex < rowCount; rowIndex++)
        {
            for (int colIndex = 0; colIndex < colCount; colIndex++)
            {
                matrix[rowIndex, colIndex] = value++;
            }
        }
        Matrix = matrix;
    }
}

using System;
using System.Collections.Generic;
using System.Text;
public class Evil
{
    Coordinates location;
    Coordinates Location { get => location; set => location = value; }

    public Evil()
    {
        Location = location;
    }

    public Evil(Coordinates loc)
    {
        Location = loc;
    }

    public int[,] RemoveStars(int [,] matrix)
    {

        while (Location.Row >= 0 && Location.Col >= 0)
        {
            if (Location.Row >= 0 && Location.Row < matrix.GetLength(0) && Location.Col >= 0 && Location.Col < matrix.GetLength(1))
            {
                matrix[Location.Row, Location.Col] = 0;
            }
            Location.Row--;
            Location.Col--;
        }

        return matrix;
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

public class Coordinates
{
    int row;
    int col;

    public int Row { get => row; set => row = value; }
    public int Col { get => col; set => col = value; }
    public Coordinates()
    {
        Row = row;
        Col = col;
    }
    public Coordinates(string input)
    {
        int[] evilLocation = input
            .Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries)
            .Select(int.Parse).ToArray();

        Row = evilLocation[0];
        Col = evilLocation[1];
    }
}
using System;
using System.Collections.Generic;
using System.Text;
public class Lover
{
    Coordinates location;
    long starsColected;

    public long StarsColected { get => starsColected; set => starsColected = value; }
    internal Coordinates Location { get => location; set => location = value; }

    public Lover(long stars)
    {
        Location = location;
        StarsColected = stars;
    }
    public Lover(Coordinates loc)
    {
        Location = loc;
    }
    public void ColectingStars(int [,] matrix, long sum)
    {

        while (Location.Row >= 0 && Location.Col < matrix.GetLength(1))
        {
            if (Location.Row >= 0 && Location.Row < matrix.GetLength(0) && Location.Col >= 0 && Location.Col < matrix.GetLength(1))
            {
                sum += matrix[Location.Row, Location.Col];
            }

            Location.Col++;
            Location.Row--;
        }

        StarsColected = sum;
    }
}