#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <iomanip>
#include <stack>
#include <algorithm>
#include <string>
#include <map>
#include <iterator>
#include <set>
#include <queue>
#include <bitset>
#include <cassert>

using namespace std;

int main() {

    long long N;
    cin >> N;

    long long A = N / (3 * 5);
    long long B = N / 3 - A;
    long long C = N / 5 - A;

    cout << (A * 4 + B * 2 + C * 2) << endl;
}