John is attempting to construct a perfect square using \(1\) x \(1\) tiles. Currently, he possesses \(X\) tiles and he wants to create a square using all the tiles he has.

Determine the minimum number of additional tiles that John needs to purchase in order to create a complete square.

Constraints

\(1 \le X \le 100\)

Input Specification

The first line of input contains one integer, \(X\), the number of tiles that John currently has.

Output Specification

Output the minimum amount of more tiles he needs to create a square.

Sample Input

7

Sample Output

2