Square root

The Problem

You are to determinate X by given Y, from expression

The Input

Input contains a positive integer Y (1<=Y<=10¹⁰⁰⁰), with no blanks or leading zeroes in it.
It is guaranteed, that for given Y, X will be always an integer.

The Output

Your program should print X in the same format as Y was given in input.

Sample Input

7206604678144

Sample Output

2684512