Problem:
Score : 200 points

Problem Statement

Find the largest square number not exceeding N. Here, a square number is an integer that can be represented as the square of an integer.

Constraints

1 \leq N \leq 10^9

N is an integer.

Input

Input is given from Standard Input in the following format:

N

Output

Print the largest square number not exceeding N.

Sample Input 1

10

Sample Output 1

9

10 is not square, but 9 = 3 × 3 is. Thus, we print 9.

Sample Input 2

81

Sample Output 2

81

Sample Input 3

271828182

Sample Output 3

271821169

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.util.Scanner;

public class Main {
	  public static void main(String args[]){
		    Scanner sc = new Scanner(System.in);

            int n = sc.nextInt();
            int hoge = 1;
            for(int i = 0; i < Math.pow(n,0.5); i++){
                if(i * i <= n){
                    hoge = i  * i;
                }
            }            
            System.out.println(hoge);
            sc.close();
		  }
}