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

cubes = []
sides = {}
surface = 0

for line in inp:
    x, y, z = line.split(',')
    cubes.append((int(x), int(y), int(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

print(surface)