import java.util.*;
class Main
{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		long n = Long.parseLong(sc.next());
		
		long sum = 0;
		
		for(int i = 1; i < n+1; ++i) {
		    if((i % 3 != 0) && (i % 5 != 0)) {
		        sum += i;
		    }
		}
		
		System.out.println(sum);
		
	}
} import java.util.*; util.* java class Main
{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		long n = Long.parseLong(sc.next());
		
		long sum = 0;
		
		for(int i = 1; i < n+1; ++i) {
		    if((i % 3 != 0) && (i % 5 != 0)) {
		        sum += i;
		    }
		}
		
		System.out.println(sum);
		
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		long n = Long.parseLong(sc.next());
		
		long sum = 0;
		
		for(int i = 1; i < n+1; ++i) {
		    if((i % 3 != 0) && (i % 5 != 0)) {
		        sum += i;
		    }
		}
		
		System.out.println(sum);
		
	} main {
		Scanner sc = new Scanner(System.in);
		
		long n = Long.parseLong(sc.next());
		
		long sum = 0;
		
		for(int i = 1; i < n+1; ++i) {
		    if((i % 3 != 0) && (i % 5 != 0)) {
		        sum += i;
		    }
		}
		
		System.out.println(sum);
		
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long n = Long.parseLong(sc.next()); n Long.parseLong(sc.next()) Long.parseLong Long sc.next() sc.next sc long sum = 0; sum 0 for(int i = 1; i < n+1; ++i) {
		    if((i % 3 != 0) && (i % 5 != 0)) {
		        sum += i;
		    }
		} int i = 1; int i = 1; i 1 i < n+1 i n+1 n 1 ++i ++i i {
		    if((i % 3 != 0) && (i % 5 != 0)) {
		        sum += i;
		    }
		} {
		    if((i % 3 != 0) && (i % 5 != 0)) {
		        sum += i;
		    }
		} if((i % 3 != 0) && (i % 5 != 0)) {
		        sum += i;
		    } (i % 3 != 0) && (i % 5 != 0) (i % 3 != 0) i % 3 i 3 0 (i % 5 != 0) i % 5 i 5 0 {
		        sum += i;
		    } sum += i sum i System.out.println(sum) System.out.println System.out System System.out sum String[] args args
import java.util.*;
class Main
{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		long n = Long.parseLong(sc.next());
		
		long sum = 0;
		
		for(int i = 1; i < n+1; ++i) {
		    if((i % 3 != 0) && (i % 5 != 0)) {
		        sum += i;
		    }
		}
		
		System.out.println(sum);
		
	}
}