public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		long sum=0;
		int N = new java.util.Scanner(System.in).nextInt();
		for(int 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) {
		// TODO Auto-generated method stub
		long sum=0;
		int N = new java.util.Scanner(System.in).nextInt();
		for(int 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) {
		// TODO Auto-generated method stub
		long sum=0;
		int N = new java.util.Scanner(System.in).nextInt();
		for(int i =1;i<=N;i++){
			if(i%3!=0&&i%5!=0)sum+=i;
		
		}
				
		System.out.println(sum);

	} main {
		// TODO Auto-generated method stub
		long sum=0;
		int N = new java.util.Scanner(System.in).nextInt();
		for(int i =1;i<=N;i++){
			if(i%3!=0&&i%5!=0)sum+=i;
		
		}
				
		System.out.println(sum);

	} long sum=0; sum 0 int N = new java.util.Scanner(System.in).nextInt(); N new java.util.Scanner(System.in).nextInt() new java.util.Scanner(System.in).nextInt new java.util.Scanner(System.in) for(int i =1;i<=N;i++){
			if(i%3!=0&&i%5!=0)sum+=i;
		
		} int i =1; int 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) {
		// TODO Auto-generated method stub
		long sum=0;
		int N = new java.util.Scanner(System.in).nextInt();
		for(int 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) {
		// TODO Auto-generated method stub
		long sum=0;
		int N = new java.util.Scanner(System.in).nextInt();
		for(int i =1;i<=N;i++){
			if(i%3!=0&&i%5!=0)sum+=i;
		
		}
				
		System.out.println(sum);

	}

	
	

} Main
public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		long sum=0;
		int N = new java.util.Scanner(System.in).nextInt();
		for(int i =1;i<=N;i++){
			if(i%3!=0&&i%5!=0)sum+=i;
		
		}
				
		System.out.println(sum);

	}

	
	

}
