
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
#define mod 1000000007
#define all(v)  v.begin(),v.end()
#define pb push_back
#define size(v)  (int) v.size()
#define fast ios_base:: sync_with_stdio(false); cin.tie(NULL);cout.tie(NULL)
ll power_mod(ll a,ll x){if(x==0) return 1;ll y=power_mod(a,x/2);ll ans=(y*y)%mod; if(x%2) ans=(ans*a)%mod;return ans;}
ll inv(ll a){return power_mod(a,mod-2);}    
ll power(ll a, ll x){ if(x==0) return 1; ll y= power(a,x/2); ll ans=(y*y); if(x%2) ans*=a; return ans;}

int main(){
	ll n;
	cin>>n;
	ll sum = 0;
	for( ll  i  = 1; i <= n; i++){
		 if(((i%5)!=0) and ((i%3)!=0)){
		 	 sum += i;
		 }
	}
	cout<<sum<<endl;
}