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

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

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

  public static void pr(String str){
    System.out.print(str);
  }
  public static void pl(String str){
    System.out.println(str);
  }
}
