구름 LEVEL : 통증

문제

import java.io.*;
import java.util.*;

// bandage : 1 감소
// medicine : 7 감소
// painkiller : 14 감소
class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
		StringTokenizer st = new StringTokenizer(br.readLine(), " ");
		
		int N = Integer.parseInt(st.nextToken());
		int item = 0;
		item += N / 14;
		N = N % 14;
		item += N / 7;
		N = N % 7;
		item += N;
		
		bw.write(String.valueOf(item));
		bw.flush();
		br.close();
		bw.close();
	}
}