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