[BOJ] 백준 2292 벌집

[문제]

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

 

 

[소스 코드]

import java.io.*;
import java.util.*;
public class Main {
	public static void main(String[] args) throws IOException {
		  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		  int n = Integer.parseInt(br.readLine());
		  int i = 1;
		  int cnt = 1;
		  while(n>cnt) {
			  cnt += 6 * i;
			  i++;
		  }
		  System.out.println(i);
	}
}