e-olymp
Problems

Perfect square

Perfect square

Positive integer n is given. If n is a perfect square of some positive integer m, then print m. Otherwise print No.

Input

One positive integer n.

Output

Print the required answer.

Time limit 1 second
Memory limit 128 MiB
Input example #1
25
Output example #1
5
Input example #2
27
Output example #2
No
Author Matviychuk Sergiy Volodymyrovych
Source "ABC programming"