from collections import defaultdict

with open("input") as f:
    puzzle_input = [n.strip() for n in f.readlines()]


lights = [[0 for _ in range(1000)] for _ in range(1000)]

for instruction in puzzle_input:
    from_coords = instruction.split(" ")[-1::-1][2]
    to_coords = instruction.split(" ")[-1::-1][0]
    from_coords = [int(x) for x in from_coords.split(",")]
    to_coords = [int(x) for x in to_coords.split(",")]

    [x_1, y_1] = from_coords
    [x_2, y_2] = to_coords

    diff = 0
    if instruction.startswith("turn on"):
        diff = 1
    elif instruction.startswith("turn off"):
        diff = -1
    else:
        diff = 2

    for x in range(x_1, x_2 + 1):
        for y in range(y_1, y_2 + 1):
            lights[x][y] = lights[x][y] + diff
            if lights[x][y] < 0:
                lights[x][y] = 0

    print(instruction, from_coords, to_coords)

brightness = 0

for row in lights:
    for light in row:
        brightness += light

print(brightness)