Bittris

using System;

class Bittris
{
    static void Main()
    {
        int rounds = int.Parse(Console.ReadLine());

        int[] playField = new int[4];
        int score = 0;
        int points = 0;
        int line = 0;
        int mask = 255;
        bool noCollision = true;

        for (int turn = 0; turn < rounds; turn++)
        {
            string input = Console.ReadLine();
            int turnRemainder = turn % 4;

            if (turnRemainder == 0) //Time for a new number?
            {
                noCollision = true;
                int number = int.Parse(input);
                line = number;

                while (number != 0)
                {
                    if ((number & 1) == 1)
                    {
                        points++;
                    }
                    number >>= 1;
                }
            }
            else if (noCollision) //Can we move?
            {
                if (input == "L" && (line & 128) != 128) //Left
                {
                    line <<= 1;
                }
                else if (input == "R" && (line & 1) != 1) //Right
                {
                    line >>= 1;
                }

                if ((playField[turnRemainder] & line) == 0) //Is the next line clear?
                {
                    if (turnRemainder == 3)
                    {
                        if ((playField[turnRemainder] + line) == mask)
                        {
                            score += (points * 10);

                            for (int i = turnRemainder; i > 0; i--)
                            {
                                playField[i] = playField[i - 1];
                            }

                            playField[0] = 0;
                        }
                        else
                        {
                            score += points;
                            playField[turnRemainder] |= line;
                        }

                        points = 0;
                    }
                }
                else //Next line is already occupied
                {
                    if ((playField[turnRemainder - 1] + line) == mask)
                    {
                        for (int i = turnRemainder - 1; i > 0; i--)
                        {
                            playField[i] = playField[i - 1];
                        }

                        score += (points * 10);
                        playField[0] = 0;
                    }
                    else
                    {
                        playField[turnRemainder - 1] |= line;
                        score += points;
                    }

                    points = 0;
                    noCollision = false;
                }
            }
        }

        Console.WriteLine(score);
    }
}