# Find how many numbers of length n are there such that each number is at least 4 smaller/greater than the number before and after it.
# Eg: if n = 5, such numbers are 39518, 15951, etc.
#
# OMG the competition is so fucked. It's like the problem leaked recently from the Google interview and its all over the internets
# even i'm trying to solve it lol
#

def numbers(n)

end

puts numbers(5)
puts numbers(7)
puts numbers(4)
