with open("./input", "r") as file:
    toPrase = list(file.read().split("\n"))

pol = 0
leds = []

for i in range(999 * 999):
    leds.append(0)

crt = 1

for command in toPrase:
    if command != "":
        cmdType = 0 #0 = turn on // 1 = turn off // 2 = toggle
        """turn on x1,y1 through x2,y2"""
        if command.startswith("turn on"):
            cmdType = 0
            crtcmd = command.replace("turn on ", "")
            start = crtcmd.split(" through ")[0]
            end = crtcmd.split(" through ")[1].replace(" through ", "")
            x1 = int(start.split(",")[0])
            y1 = int(start.split(",")[1])
            x2 = int(end.split(",")[0])
            y2 = int(end.split(",")[1])
        if command.startswith("turn off"):
            cmdType = 1
            crtcmd = command.replace("turn off ", "")
            start = crtcmd.split(" through ")[0]
            end = crtcmd.split(" through ")[1].replace(" through ", "")
            x1 = int(start.split(",")[0])
            y1 = int(start.split(",")[1])
            x2 = int(end.split(",")[0])
            y2 = int(end.split(",")[1])
        if command.startswith("toggle"):
            cmdType = 2
            crtcmd = command.replace("toggle ", "")
            start = crtcmd.split(" through ")[0]
            end = crtcmd.split(" through ")[1].replace(" through ", "")
            x1 = int(start.split(",")[0])
            y1 = int(start.split(",")[1])
            x2 = int(end.split(",")[0])
            y2 = int(end.split(",")[1])
        for x in range(x1-1, x2):
            for y in range(y1-1, y2):
                index = 1000 * x + y+1
                if cmdType == 0:
                    leds[index] = 1
                if cmdType == 1:
                    leds[index] = 0
                if cmdType == 2:
                    if leds[index] == 0:
                        leds[index] = 1
                    elif leds[index] == 1:
                        leds[index] = 0
        print(f"succesfully parsed command \"{command}\" ({crt}/{len(toPrase)})")
        crt += 1


for led in leds:
    if led == 1:
        pol += 1

print(pol)