from lib import *

data = open(0).read()

part_2 = True
lights = [[0 for _ in range(1000)] for _ in range(1000)]

for line in data.splitlines():
    x1, y1, x2, y2 = str_to_ints(line)
    for x in range(x1, x2 + 1):
        for y in range(y1, y2 + 1):
            if part_2:
                if "on" in line:
                    lights[x][y] += 1
                elif "off" in line:
                    lights[x][y] = max(0, lights[x][y] - 1)
                else:
                    lights[x][y] += 2
            else:
                if "on" in line:
                    lights[x][y] = 1
                elif "off" in line:
                    lights[x][y] = 0
                else:
                    if lights[x][y] == 1:
                        lights[x][y] = 0
                    else:
                        lights[x][y] = 1

res = 0
for row in lights:
    res += sum(row)
print(res)