Description

Xiaoming starts working now with an annual salary of $N$ ten thousand yuan. He wants to buy a $60$ square meter house near Ningbo, which currently costs $2$ million yuan. Assuming the house price increases by $K$ percent each year, and Xiaoming's annual salary remains unchanged, and he neither eats nor drinks, nor pays taxes, saving all his annual income of $N$ ten thousand yuan, in which year can he afford to buy the house? (In the first year, his salary is $N$ ten thousand yuan, and the house price is $2$ million yuan).

Input Format

A single line containing two positive integers $N$ ($10≤N≤50$) and $K$ ($1≤K≤20$), separated by a space.

Output Format

If Xiaoming can buy the house in the $20$th year or earlier, output an integer $M$, representing the earliest year he can buy the house; otherwise, output "Impossible".

Sample

50 10

8