package main

import (
	"fmt"
	"io"
	"log"
	"os"
	"strconv"
	"strings"
)

func main() {
	var input []string
	var readInp string
	for {
		_, err := fmt.Scan(&readInp)
		if err != nil {
			if err != io.EOF {
				log.Fatal(err)
			}
			break
		}
		input = append(input, readInp)
	}

	var lights [][]int
	for i := 0; i < 1000; i++ {
		lights = append(lights, make([]int, 1000))
	}
	for i := range input {
		if input[i] == "on" || input[i] == "off" || input[i] == "toggle" {
			stX, stY := parseLocations(input[i+1])
			endX, endY := parseLocations(input[i+3])
			for ix := stX; ix <= endX; ix++ {
				for iy := stY; iy <= endY; iy++ {
					if input[i] == "on" {
						lights[ix][iy]++
					} else if input[i] == "off" {
						if lights[ix][iy] > 0 {
							lights[ix][iy]--
						}
					} else if input[i] == "toggle" {
						lights[ix][iy] += 2
					}
				}
			}
		}
	}
	var brightness int
	for i := 0; i < 1000; i++ {
		for j := 0; j < 1000; j++ {
			brightness += lights[i][j]
		}
	}
	fmt.Printf("Brightness: %d\n", brightness)
}

func parseLocations(s string) (int, int) {
	dirSplit := strings.Split(s, ",")
	return assertAtoi(dirSplit[0]), assertAtoi(dirSplit[1])
}

func assertAtoi(s string) int {
	ret, err := strconv.Atoi(s)
	if err != nil {
		fmt.Println("Error in Atoi: " + s)
		os.Exit(1)
	}
	return ret
}