#include<iostream>
#include<stdio.h>
#include<algorithm>
#include<vector>
#include<string.h>
#include<math.h>
#include<map>
#include<iomanip>
#include<queue>

using namespace std;

int main(){
	long long n;
	cin >> n;
	long long ans=n/15*16;
	
	if(n%15>=3)ans+=2;
	if(n%15>=5)ans+=2;
	if(n%15>=6)ans+=2;
	if(n%15>=9)ans+=2;
	if(n%15>=10)ans+=2;
	if(n%15>=12)ans+=2;
		
	cout << ans << endl;
	return 0;
}