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