UVa 10633 - Rare Easy Problem

Summary
This is a math problem.

Explanation
ONE of the result is N_1 = $$(N*10)/9$$ (1)

Now The question is how to calculate the second one (there is only two results). Just iterate from $$N_1-10$$ to $$N_1+10$$ and look for the answer.

Gotchas

 * Be careful of overflows