#define _USE_MATH_DEFINES
#define _CRT_SECURE_NO_WARNINGS
#include "bits/stdc++.h"
#define rep(i,n) for(int i = 0;i < n;i++)
#define P(p) cout<<(p)<<endl;
#define pi 3.1415926535
using namespace std;
typedef long long ll;
int dx[] = { 0, 1, 0, -1 };
int dy[] = { -1, 0, 1, 0 };

unsigned long long sttoi(std::string str) {
	unsigned long long ret;
	std::stringstream ss; ss << str;
	ss >> ret;
	return ret;
}

ll gcd(ll a, ll b){
	if (b > a)swap(a, b); if (b == 0)return a; else{ return gcd(b, a%b); }
}

void solve() {
	int n;
	cin >> n;
	int sum = 0;
	for (int i = 1; i <= n;i++){
		if (i % 3 == 0 && i % 5 == 0){
			sum += 4;
		}
		else if (i % 3 == 0 || i % 5 == 0){
			sum += 2;
		}
	}
	P(sum);
}

int main() {
	solve();
	return 0;
}