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: Accepted)

import java.util.*;

class Main{            
     
   public static void main(String[] args){
       Scanner sc = new Scanner(System.in);  
       
       int N = sc.nextInt();
       
       int max =  Integer.MIN_VALUE;
               
       for(int i = 1 ;i*i <=N;i++){
           max = Math.max(i*i,max);
       }

       System.out.println(max);
      
       
       
       
   }
}