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