import java.util.*;

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

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