
#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <map>
#include <cmath>
#include <queue>
#include <set>
#include <stack>
#include <numeric>




typedef long long ll;

#define rep(i, n) for (ll i = 0; i < (ll)(n); i++)
#define _GLIBCXX_DEBAC
/*map<Keyの型, Valueの型> 変数名;
queue<型> 変数名;
priority_queue<型> 変数名;
priority_queue<型, vector<型>, greater<型>> 変数名;*/
//copy(v1.begin(), v1.end(), back_inserter(v2));
using namespace std;

ll gcd(ll a, ll b) {
	ll c;
	if (a < b) {
		c = a; a = b; b = c;
	}
	while (b != 0) {
		c = a % b; a = b; b = c;
	}
	return a;
}

ll lcm(ll a, ll b) {
	ll c;
	c = a * b / gcd(a, b);
	return c;
}

int sort_greater(int m,int n) {
	vector<int> a(m);
	for (int i = 0; i < m; i++) {
		cin >> a[i];
	}
	sort(a.begin(), a.end(),greater<int>());
	for (int i = 0; i < n; i++) {
		cout << a[i];
	}
		return 0;
}

int bubblesort(int a[], int n) {
	int sw = 0;
	bool flag = 1;
	for (int i = 0; flag; i++) {
		flag = 0;
		for (int j = n - 1; j >= i + 1; j--) {
			if (a[j] < a[j - 1]) {
				swap(a[j], a[j - 1]);
				flag = 1;
				sw += 1;
			}
		}
	}
	return sw;
}

int a_z()
{
	for (int i = 0; i <= ('Z' - 'A'); i++) {
		cout << (char)('A' + i);
	}
	return 0;
}

int selecttionsort(int a[], int n) {
	int t,sw = 0, minj;
	for (int i = 0; i < n - 1; i++) {
		minj = i;
		for (int j = 0; j < n - 1; j++) {
			if (a[j] < a[minj]) {
				minj = j;
			}
		}
		t = a[i]; a[i] = a[minj]; a[minj] = t;
		if (i != minj) sw += 1;

	}
	return sw;
}

bool is_prime(int x) {
	if (x <= 1) return false;
	for (int i = 2; i * i <= x; i++) {
		if (x % i == 0) return false;
	}
	return true;
}

const ll mod = 1000000007;
struct mint {
	ll x;
	mint(ll x = 0):x(x%mod){}
	mint& operator+=(const mint a) {
		if ((x += a.x) >= mod) x -= mod;
		return *this;
	}
	mint& operator-=(const mint a) {
		if ((x += mod - a.x) >= mod) x -= mod;
		return *this;
	}
	mint& operator*=(const mint a) {
		(x *= a.x) %= mod;
		return *this;
	}
	mint operator+(const mint a) const {
		mint res(*this);
		return res += a;
	}
	mint operator-(const mint a) const {
		mint res(*this);
		res -= a;
	}
	mint operator*(const mint a)const {
		mint res(*this);
		return res *= a;
	}
};

map<string, int> memo;

using P=pair<int, int>;

struct Clock {
	int hour, minute, second;
	void set(int h, int m, int s) {
		hour = h; minute = m; second = s;
	}
	string to_str() {
		string h, m, s;
		h = to_string(hour);
		m= to_string(minute);
		s= to_string(second);
		if (h.size() < 2) h = "0" + h;
		if (m.size() < 2) m = "0" + m;
		if (s.size() < 2) s = "0" + s;
		return h + ":" + m + ":" + s;
	}
	void shift(int diff_second) {
		int h, m;
		h = diff_second / 3600;
		m = diff_second / 60;
		diff_second %= 60;
		second += diff_second;
		
	}
};


/*void dfs(int v, int p = -1) {
	for (int u : to[v]) {
		if (u == p) continue;
		ans[u] += ans[v];
		dfs(u, v);
	}
}*/
int main() {
	ll n;
	cin >> n;
	ll ans = 0;
	rep(i, n ) {
		if (i % 3 == 0) continue;
		if (i % 5 == 0) continue;
		if (i % 15 == 0) continue;
		ans += i;
	}
	cout << ans;
	return 0;
}








