#include <iostream>
#include <string>
using namespace std;

int main()
{
    long N;
    cin >> N;

    int count = 0;
    for(int i = 1; i <= N; i++){
        if(i % 15 == 0)
            count += 4;
        else if(i % 3 == 0)
            count += 2;
        else if(i % 5 == 0)
            count += 2;
    }

    cout << count <<endl;

    return 0;
}