import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int count = 1;
    long sum = 0;
    int i = 1;

    do{
      if(i%3!=0&&i%5!=0){
        sum += i;
      }
      count +=1;
      i++;
    }while(count<=n);

    System.out.println(sum);

  }
} import java.util.*; util.* java public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int count = 1;
    long sum = 0;
    int i = 1;

    do{
      if(i%3!=0&&i%5!=0){
        sum += i;
      }
      count +=1;
      i++;
    }while(count<=n);

    System.out.println(sum);

  }
} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int count = 1;
    long sum = 0;
    int i = 1;

    do{
      if(i%3!=0&&i%5!=0){
        sum += i;
      }
      count +=1;
      i++;
    }while(count<=n);

    System.out.println(sum);

  } main {
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int count = 1;
    long sum = 0;
    int i = 1;

    do{
      if(i%3!=0&&i%5!=0){
        sum += i;
      }
      count +=1;
      i++;
    }while(count<=n);

    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 int count = 1; count 1 long sum = 0; sum 0 int i = 1; i 1 do{
      if(i%3!=0&&i%5!=0){
        sum += i;
      }
      count +=1;
      i++;
    }while(count<=n); count<=n count n {
      if(i%3!=0&&i%5!=0){
        sum += i;
      }
      count +=1;
      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 count +=1 count 1 i++ 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);

    int n = sc.nextInt();
    int count = 1;
    long sum = 0;
    int i = 1;

    do{
      if(i%3!=0&&i%5!=0){
        sum += i;
      }
      count +=1;
      i++;
    }while(count<=n);

    System.out.println(sum);

  }
} public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int count = 1;
    long sum = 0;
    int i = 1;

    do{
      if(i%3!=0&&i%5!=0){
        sum += i;
      }
      count +=1;
      i++;
    }while(count<=n);

    System.out.println(sum);

  }
} Main
import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    int n = sc.nextInt();
    int count = 1;
    long sum = 0;
    int i = 1;

    do{
      if(i%3!=0&&i%5!=0){
        sum += i;
      }
      count +=1;
      i++;
    }while(count<=n);

    System.out.println(sum);

  }
}