import os

input = open(os.path.dirname(__file__) +
             "/input.txt", "r").readlines()

beacons = []
sensors = []
distance = []

for line in input:
    l = line.strip().split()
    sx = int(l[2].split('=')[1].split(',')[0])
    sy = int(l[3].split('=')[1].split(':')[0])
    bx = int(l[8].split('=')[1].split(',')[0])
    by = int(l[9].split('=')[1])
    d = abs(bx-sx)+abs(by-sy)
    distance.append(d)
    beacons.append((bx, by))
    sensors.append((sx, sy))
    print(sx, sy, bx, by, d)


def getcoverage(b, Y):
    coverage = set()
    (x, y) = sensors[b]
    d0 = distance[i]
    print("check", x, y, d0)
    for X in range(x-d0, x+d0):
        if (abs(x-X)+abs(y-Y)) <= d0:
            coverage.add((X, Y))
    return coverage


testy = 2000000

fullcoverage = set()
for i in range(len(sensors)):
    cov = getcoverage(i, testy)
    fullcoverage.update(cov)

testset = set()
for s in fullcoverage:
    if s[1] == testy:
        testset.add(s)

nonbeacons = testset.difference(set(beacons))

print(len(nonbeacons))