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