import java.util.Scanner;

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

public class Main{
  public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    long ans = 0;
    for(int i = 1;i <= a;i++){
      if(!(i % 3 == 0 || i % 5 == 0)){
        ans += i;
      }
    }
    System.out.println(ans);
  }
}