import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
  public static void main(String[] args) {
    InputStream inputStream = System.in;
    OutputStream outputStream = System.out;
    Scanner in = new Scanner(inputStream);
    PrintWriter out = new PrintWriter(outputStream);
    B solver = new B();
    solver.solve(1, in, out);
    out.close();
  }

  static class B {
    public void solve(int testNumber, Scanner in, PrintWriter out) {
      int N = in.nextInt();
      long res = 0;

      for (int i = 1; i <= N; i++) {
        if (i % 3 != 0 && i % 5 != 0) res += i;
      }
      out.print(res);
    }

  }
}
 import java.io.OutputStream; OutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.Scanner; Scanner java.util public class Main {
  public static void main(String[] args) {
    InputStream inputStream = System.in;
    OutputStream outputStream = System.out;
    Scanner in = new Scanner(inputStream);
    PrintWriter out = new PrintWriter(outputStream);
    B solver = new B();
    solver.solve(1, in, out);
    out.close();
  }

  static class B {
    public void solve(int testNumber, Scanner in, PrintWriter out) {
      int N = in.nextInt();
      long res = 0;

      for (int i = 1; i <= N; i++) {
        if (i % 3 != 0 && i % 5 != 0) res += i;
      }
      out.print(res);
    }

  }
} Main public static void main(String[] args) {
    InputStream inputStream = System.in;
    OutputStream outputStream = System.out;
    Scanner in = new Scanner(inputStream);
    PrintWriter out = new PrintWriter(outputStream);
    B solver = new B();
    solver.solve(1, in, out);
    out.close();
  } main {
    InputStream inputStream = System.in;
    OutputStream outputStream = System.out;
    Scanner in = new Scanner(inputStream);
    PrintWriter out = new PrintWriter(outputStream);
    B solver = new B();
    solver.solve(1, in, out);
    out.close();
  } InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out Scanner in = new Scanner(inputStream); in new Scanner(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) B solver = new B(); solver new B() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class B {
    public void solve(int testNumber, Scanner in, PrintWriter out) {
      int N = in.nextInt();
      long res = 0;

      for (int i = 1; i <= N; i++) {
        if (i % 3 != 0 && i % 5 != 0) res += i;
      }
      out.print(res);
    }

  } B public void solve(int testNumber, Scanner in, PrintWriter out) {
      int N = in.nextInt();
      long res = 0;

      for (int i = 1; i <= N; i++) {
        if (i % 3 != 0 && i % 5 != 0) res += i;
      }
      out.print(res);
    } solve {
      int N = in.nextInt();
      long res = 0;

      for (int i = 1; i <= N; i++) {
        if (i % 3 != 0 && i % 5 != 0) res += i;
      }
      out.print(res);
    } int N = in.nextInt(); N in.nextInt() in.nextInt in long res = 0; res 0 for (int i = 1; i <= N; i++) {
        if (i % 3 != 0 && i % 5 != 0) res += i;
      } int i = 1; int i = 1; i 1 i <= N i N i++ i++ i {
        if (i % 3 != 0 && i % 5 != 0) res += i;
      } {
        if (i % 3 != 0 && i % 5 != 0) res += i;
      } if (i % 3 != 0 && i % 5 != 0) res += i; i % 3 != 0 && i % 5 != 0 i % 3 != 0 i % 3 i 3 0 i % 5 != 0 i % 5 i 5 0 res += i res i out.print(res) out.print out res int testNumber testNumber Scanner in in PrintWriter out out public class Main {
  public static void main(String[] args) {
    InputStream inputStream = System.in;
    OutputStream outputStream = System.out;
    Scanner in = new Scanner(inputStream);
    PrintWriter out = new PrintWriter(outputStream);
    B solver = new B();
    solver.solve(1, in, out);
    out.close();
  }

  static class B {
    public void solve(int testNumber, Scanner in, PrintWriter out) {
      int N = in.nextInt();
      long res = 0;

      for (int i = 1; i <= N; i++) {
        if (i % 3 != 0 && i % 5 != 0) res += i;
      }
      out.print(res);
    }

  }
} public class Main {
  public static void main(String[] args) {
    InputStream inputStream = System.in;
    OutputStream outputStream = System.out;
    Scanner in = new Scanner(inputStream);
    PrintWriter out = new PrintWriter(outputStream);
    B solver = new B();
    solver.solve(1, in, out);
    out.close();
  }

  static class B {
    public void solve(int testNumber, Scanner in, PrintWriter out) {
      int N = in.nextInt();
      long res = 0;

      for (int i = 1; i <= N; i++) {
        if (i % 3 != 0 && i % 5 != 0) res += i;
      }
      out.print(res);
    }

  }
} Main
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
  public static void main(String[] args) {
    InputStream inputStream = System.in;
    OutputStream outputStream = System.out;
    Scanner in = new Scanner(inputStream);
    PrintWriter out = new PrintWriter(outputStream);
    B solver = new B();
    solver.solve(1, in, out);
    out.close();
  }

  static class B {
    public void solve(int testNumber, Scanner in, PrintWriter out) {
      int N = in.nextInt();
      long res = 0;

      for (int i = 1; i <= N; i++) {
        if (i % 3 != 0 && i % 5 != 0) res += i;
      }
      out.print(res);
    }

  }
}

