#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<cmath>
#include<stdio.h>
#include<queue>
#include <climits>
#include <map>
#include <set>
const int mod = 1e9 + 7;
const long long INF = 1LL << 60;
using namespace std;
typedef long long ll;

int main()
{
    ll n;
    cin >> n;
    ll ans = 0;
    ans += ((n / 15) * 16);
    n %= 15;
    ans += ((n / 3) * 2);
    ans += ((n / 5) * 2);
    cout << ans << endl;
}