#include <iostream>		//cin, cout
#include <vector>		//vector
#include <algorithm>	//sort,min,max,count
#include <string>		//string,getline, to_string
#include <cstdlib>		//abs(int)
#include <utility>		//swap, pair
#include <deque>		//deque
#include <climits>		//INT_MAX
#include <bitset>		//bitset
#include <cmath>		//sqrt, ceil. M_PI, pow, sin

using namespace std;

int main() {

	long long int N;
	cin >> N;

	long long int ans = 0;
	
	ans += (N / 15) * 16;
	N = N % 15;
	ans += (N / 5) * 2;
	ans += (N / 3) * 2;

	cout << ans << endl;

	return 0;

}