I tested a lot of numbers, but in test # 8, I got WA, can anybody help me, or maybe can give the test.

Hey willy como va che te cuento q no se como sera eso del error 8 pero ya lo resolvi el problema en java. 0.125 s si encuentras una solucion mejor me avisas

Hi, i think it cannot be less than that time .. god job...

Try this test:

Input:
0

Output:
10

I got this ... but I still get WA.