**PROBLEM LINK:** Problem

**Author and editorialist**: Denis Anishchenko

**Tester**: Hasan Jaddouh

**DIFFICULTY**: Simple

**PREREQUISITES**: Basic maths

**EXPLANATION**:

If X is divisible by 10 then the answer is 0. If X is divisible only by 5 then the answer is 1, because after the first multiplying X will be divisible by 10. Otherwise, the answer is -1, because we will never get 5 by multiplying on 2.