#reading input
with open('input18.txt','r') as f:
    inp = f.read().splitlines(keepends=False)

cubes = []
sides = {}
surface = 0
maxX = None
maxY = None
maxZ = None
minX = None
minY = None
minZ = None
bubbles = []
bubbleSides = {}
insideSurface = 0


for line in inp:
    x, y, z = line.split(',')
    x = int(x)
    y = int(y)
    z = int(z)
    if maxX == None or x > maxX:
        maxX = x
    if minX == None or x < minX:
        minX = x
    if maxY == None or y > maxY:
        maxY = y
    if minY == None or y < minY:
        minY = y
    if maxZ == None or z > maxZ:
        maxZ = z
    if minZ == None or z < minZ:
        minZ = z
    cubes.append((x, y, z))


#main function
for cube in cubes:
    x, y, z = cube
    sides[((x - 1, x),(y, y),(z, z))] = sides.get(((x - 1, x),(y, y),(z, z)), 0) + 1
    sides[((x, x + 1),(y, y),(z, z))] = sides.get(((x, x + 1),(y, y),(z, z)), 0) + 1
    sides[((x, x),(y - 1, y),(z, z))] = sides.get(((x, x),(y - 1, y),(z, z)), 0) + 1
    sides[((x, x),(y, y + 1),(z, z))] = sides.get(((x, x),(y, y + 1),(z, z)), 0) + 1
    sides[((x, x),(y, y),(z - 1, z))] = sides.get(((x, x),(y, y),(z - 1, z)), 0) + 1
    sides[((x, x),(y, y),(z, z + 1))] = sides.get(((x, x),(y, y),(z, z + 1)), 0) + 1

for side in sides:
    if sides[side] == 1:
        surface += 1

for x in range(minX, maxX + 1):
    for y in range(minY, maxY + 1):
        for z in range(minZ, maxZ + 1):
            bubbles.append((x, y, z))

for cube in cubes:
    if cube in bubbles:
        bubbles.remove(cube)
outsideBubbles = []
for bubble in bubbles:
    x, y, z = bubble
    if x in [minX, maxX] or y in [minY, maxY] or z in [minZ, maxZ]:
        outsideBubbles.append((x, y, z))

done = False
while not done:
    done = True
    for bubble in outsideBubbles:
        bubbleSides.setdefault(bubble, 1)
    for bubble in bubbles:
        x, y, z = bubble
        if any(i in bubbleSides for i in((x - 1, y, z), (x + 1, y, z), (x, y - 1, z), (x, y + 1, z), (x, y, z - 1), (x, y, z + 1))):
            if  (x, y, z) not in outsideBubbles:
                outsideBubbles.append((x, y, z))
                done = False

for bubble in outsideBubbles:
    if bubble in bubbles:
        bubbles.remove(bubble)

bubbleSides = {}
for bubble in bubbles:
    x, y, z = bubble
    bubbleSides[((x - 1, x),(y, y),(z, z))] = bubbleSides.get(((x - 1, x),(y, y),(z, z)), 0) + 1
    bubbleSides[((x, x + 1),(y, y),(z, z))] = bubbleSides.get(((x, x + 1),(y, y),(z, z)), 0) + 1
    bubbleSides[((x, x),(y - 1, y),(z, z))] = bubbleSides.get(((x, x),(y - 1, y),(z, z)), 0) + 1
    bubbleSides[((x, x),(y, y + 1),(z, z))] = bubbleSides.get(((x, x),(y, y + 1),(z, z)), 0) + 1
    bubbleSides[((x, x),(y, y),(z - 1, z))] = bubbleSides.get(((x, x),(y, y),(z - 1, z)), 0) + 1
    bubbleSides[((x, x),(y, y),(z, z + 1))] = bubbleSides.get(((x, x),(y, y),(z, z + 1)), 0) + 1

for side in bubbleSides:
    if bubbleSides[side] == 1:
        insideSurface += 1

print(surface - insideSurface)