|Codeforces Round #460 (Div. 2)|
We consider a positive integer perfect, if and only if the sum of its digits is exactly 10. Given a positive integer k, your task is to find the k-th smallest perfect positive integer.
A single line with a positive integer k (1 ≤ k ≤ 10 000).
A single number, denoting the k-th smallest perfect integer.
The first perfect integer is 19 and the second one is 28.