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;

class Main{
  public static void main(String args[]){
    
    Scanner scan = new Scanner(System.in);
    int number = Integer.parseInt(scan.next());
	
	int i = 1;
    while (i < number){
        if((i*i <= number) && ((i+1)*(i+1) > number)){
        	System.out.println(i*i);
        	break;
        }
        i++;
    }
	return;
  }
}