Description

Xiaoming is happily swimming, but he soon realizes that he doesn't have enough strength, and swimming is quite tiring. In the first unit of time, Xiaoming can swim $2$ meters. However, as he gets more tired, his strength decreases, and in each subsequent unit of time, he can only swim $98\%$ of the distance he swam in the previous step. Xiaoming wants to know how many steps he needs to swim to reach a distance of $x$ meters. Please write a program to solve this problem.

Input Format

Input a real number $x$ ($1≤x≤99.9$), representing the target distance to swim.

Output Format

Output an integer representing the total number of units of time Xiaoming needs to swim.

Sample

5.89

4