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