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