# Input: List of lines "<#>,<#>,<#>" (x,y,z coords of unit cubes)
# Output: Number of faces not connected to another cube

cubes = []

input_data = open(r"c:\users\edward\desktop\personal\aoc2022\18_input.txt")
for input_line in input_data.read().splitlines():
    input_line = input_line.replace("\n", "")
    coordinates = input_line.split(",")
    x, y, z = int(coordinates[0]), int(coordinates[1]), int(coordinates[2])
    cubes.append([x, y, z])

offsets = [
    [1, 0, 0],
    [-1, 0, 0],
    [0, 1, 0],
    [0, -1, 0],
    [0, 0, 1],
    [0, 0, -1]
]

number_faces = 0
for cube in cubes:
    for offset in offsets:
        adjacent = False
        for cube2 in cubes:
            if cube2[0] == cube[0] + offset[0] and cube2[1] == cube[1] + offset[1] and cube2[2] == cube[2] + offset[2]:
                adjacent = True
                break
        if not adjacent:
            number_faces += 1

print (number_faces)