BOJ[JAVA]_13909 창문 닫기

https://www.acmicpc.net/problem/13909

13909번: 창문 닫기

 

import java.util.Scanner;
 
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n=sc.nextInt();
		System.out.println((int)Math.floor(Math.sqrt(n)));			
	}
}