# Header
header = "P3 512 512 255" # 14 bytes

# Black pixels
# Counting leading pixels, every value takes up 2 bytes
black_image_len = len(header) + (2 * 512 * 512)
print(black_image_len) # 524302

# White pixels
# Counting leading pixels, every value takes up 4 bytes
white_image_len = len(header) + (4 * 512 * 512)
print(white_image_len) # 1048590