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