import java.util.*;
import java.lang.*;
import java.io.*;

public class Main {

    public static void main(String[] args) {

      Scanner sc = new Scanner(System.in);
      
      int n = sc.nextInt();
      long sum = 0;

      for(int i=1; i<=n; i++){
        if(i%3==0)
          continue;
        else if(i%5==0)
          continue;
        else
          sum+=i;
      }
      System.out.println(sum);

      sc.close();
   }
} import java.util.*; util.* java import java.lang.*; lang.* java import java.io.*; io.* java public class Main {

    public static void main(String[] args) {

      Scanner sc = new Scanner(System.in);
      
      int n = sc.nextInt();
      long sum = 0;

      for(int i=1; i<=n; i++){
        if(i%3==0)
          continue;
        else if(i%5==0)
          continue;
        else
          sum+=i;
      }
      System.out.println(sum);

      sc.close();
   }
} Main public static void main(String[] args) {

      Scanner sc = new Scanner(System.in);
      
      int n = sc.nextInt();
      long sum = 0;

      for(int i=1; i<=n; i++){
        if(i%3==0)
          continue;
        else if(i%5==0)
          continue;
        else
          sum+=i;
      }
      System.out.println(sum);

      sc.close();
   } main {

      Scanner sc = new Scanner(System.in);
      
      int n = sc.nextInt();
      long sum = 0;

      for(int i=1; i<=n; i++){
        if(i%3==0)
          continue;
        else if(i%5==0)
          continue;
        else
          sum+=i;
      }
      System.out.println(sum);

      sc.close();
   } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc long sum = 0; sum 0 for(int i=1; i<=n; i++){
        if(i%3==0)
          continue;
        else if(i%5==0)
          continue;
        else
          sum+=i;
      } int i=1; int i=1; i 1 i<=n i n i++ i++ i {
        if(i%3==0)
          continue;
        else if(i%5==0)
          continue;
        else
          sum+=i;
      } {
        if(i%3==0)
          continue;
        else if(i%5==0)
          continue;
        else
          sum+=i;
      } if(i%3==0)
          continue;
        else if(i%5==0)
          continue;
        else
          sum+=i; i%3==0 i%3 i 3 0 continue; if(i%5==0)
          continue;
        else
          sum+=i; i%5==0 i%5 i 5 0 continue; sum+=i sum i System.out.println(sum) System.out.println System.out System System.out sum sc.close() sc.close sc String[] args args public class Main {

    public static void main(String[] args) {

      Scanner sc = new Scanner(System.in);
      
      int n = sc.nextInt();
      long sum = 0;

      for(int i=1; i<=n; i++){
        if(i%3==0)
          continue;
        else if(i%5==0)
          continue;
        else
          sum+=i;
      }
      System.out.println(sum);

      sc.close();
   }
} public class Main {

    public static void main(String[] args) {

      Scanner sc = new Scanner(System.in);
      
      int n = sc.nextInt();
      long sum = 0;

      for(int i=1; i<=n; i++){
        if(i%3==0)
          continue;
        else if(i%5==0)
          continue;
        else
          sum+=i;
      }
      System.out.println(sum);

      sc.close();
   }
} Main
import java.util.*;
import java.lang.*;
import java.io.*;

public class Main {

    public static void main(String[] args) {

      Scanner sc = new Scanner(System.in);
      
      int n = sc.nextInt();
      long sum = 0;

      for(int i=1; i<=n; i++){
        if(i%3==0)
          continue;
        else if(i%5==0)
          continue;
        else
          sum+=i;
      }
      System.out.println(sum);

      sc.close();
   }
}