🐣 문제

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

🐥 코드

/*
문제 : 벌집
링크 : https://www.acmicpc.net/problem/2292
*/

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

/*
1, 6, 12, 18, 24

1, 7, 19, 37, 61 
*/

int main() {
	int n; 
	cin >> n;

	if (n == 1) cout << 1;
	else{
		n -= 1;
		int cnt = 0;
		while(n > 0){
			n = n - 6 * cnt;
			cnt += 1;
		}

		cout << cnt;
	}
	
	return 0;
}