백준 2292 벌집 / JAVA

https://www.acmicpc.net/problem/2292

2292번: 벌집

 

 

>풀이

 

import java.util.Scanner;

/*
 * 백준 2292 벌집
 * #브론즈2
 */
public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		
		int pass = 1;
		int num = 2;
		if(N == 1) {
			System.out.println(1);
		} else {
			while(num <= N) {
				num = num + (pass * 6);
				pass++;
			}
            System.out.println(pass);
		}
	}
}