Write a function that returns the smallest N-digit number which is a multiple of the specified value.
smallest(3, 8) ➞ 104
# Smallest 3-digit integer that is a multiple of 8
smallest(5, 12) ➞ 10008
smallest(7, 1) ➞ 1000000
smallest(2, 3) ➞ 12
N/A