import java.util.*;

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

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