import java.util.*;
import java.io.*;
public class Main
{
 static Hashtable<String ,Integer>hash=new Hashtable<>();
  public static void main(String args[]) throws java.lang.Exception
  {
    MyScanner sc = new MyScanner();
  
     //  hash=new Hashtable<>();

    int n=Integer.parseInt(sc.nextLine());
    long c=0;
    for(int k=1;k<=n;k++)
    {
      if(k%3==0 || k%5==0){}
        else{c+=(long)k;}
    }
    System.out.println(c);
      
       
     
     
   }
     
  
  

  
  }

   class MyScanner {
      BufferedReader br;
      StringTokenizer st;
 
      public MyScanner() {
         br = new BufferedReader(new InputStreamReader(System.in));
      }
 
      String next() {
          while (st == null || !st.hasMoreElements()) {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          return st.nextToken();
      }
 
      int nextInt() {
          return Integer.parseInt(next());
      }
 
      long nextLong() {
          return Long.parseLong(next());
      }
 
      double nextDouble() {
          return Double.parseDouble(next());
      }
 
      String nextLine(){
          String str = "";
    try {
       str = br.readLine();
    } catch (IOException e) {
       e.printStackTrace();
    }
    return str;
      }
 
   } import java.util.*; util.* java import java.io.*; io.* java public class Main
{
 static Hashtable<String ,Integer>hash=new Hashtable<>();
  public static void main(String args[]) throws java.lang.Exception
  {
    MyScanner sc = new MyScanner();
  
     //  hash=new Hashtable<>();

    int n=Integer.parseInt(sc.nextLine());
    long c=0;
    for(int k=1;k<=n;k++)
    {
      if(k%3==0 || k%5==0){}
        else{c+=(long)k;}
    }
    System.out.println(c);
      
       
     
     
   }
     
  
  

  
  } Main static Hashtable<String ,Integer>hash=new Hashtable<>(); hash new Hashtable<>() public static void main(String args[]) throws java.lang.Exception
  {
    MyScanner sc = new MyScanner();
  
     //  hash=new Hashtable<>();

    int n=Integer.parseInt(sc.nextLine());
    long c=0;
    for(int k=1;k<=n;k++)
    {
      if(k%3==0 || k%5==0){}
        else{c+=(long)k;}
    }
    System.out.println(c);
      
       
     
     
   } main {
    MyScanner sc = new MyScanner();
  
     //  hash=new Hashtable<>();

    int n=Integer.parseInt(sc.nextLine());
    long c=0;
    for(int k=1;k<=n;k++)
    {
      if(k%3==0 || k%5==0){}
        else{c+=(long)k;}
    }
    System.out.println(c);
      
       
     
     
   } MyScanner sc = new MyScanner(); sc new MyScanner() int n=Integer.parseInt(sc.nextLine()); n Integer.parseInt(sc.nextLine()) Integer.parseInt Integer sc.nextLine() sc.nextLine sc long c=0; c 0 for(int k=1;k<=n;k++)
    {
      if(k%3==0 || k%5==0){}
        else{c+=(long)k;}
    } int k=1; int k=1; k 1 k<=n k n k++ k++ k {
      if(k%3==0 || k%5==0){}
        else{c+=(long)k;}
    } {
      if(k%3==0 || k%5==0){}
        else{c+=(long)k;}
    } if(k%3==0 || k%5==0){}
        else{c+=(long)k;} k%3==0 || k%5==0 k%3==0 k%3 k 3 0 k%5==0 k%5 k 5 0 {} {c+=(long)k;} c+=(long)k c (long)k System.out.println(c) System.out.println System.out System System.out c String args[] args class MyScanner {
      BufferedReader br;
      StringTokenizer st;
 
      public MyScanner() {
         br = new BufferedReader(new InputStreamReader(System.in));
      }
 
      String next() {
          while (st == null || !st.hasMoreElements()) {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          return st.nextToken();
      }
 
      int nextInt() {
          return Integer.parseInt(next());
      }
 
      long nextLong() {
          return Long.parseLong(next());
      }
 
      double nextDouble() {
          return Double.parseDouble(next());
      }
 
      String nextLine(){
          String str = "";
    try {
       str = br.readLine();
    } catch (IOException e) {
       e.printStackTrace();
    }
    return str;
      }
 
   } MyScanner BufferedReader br; br StringTokenizer st; st public MyScanner() {
         br = new BufferedReader(new InputStreamReader(System.in));
      } MyScanner {
         br = new BufferedReader(new InputStreamReader(System.in));
      } br = new BufferedReader(new InputStreamReader(System.in)) br new BufferedReader(new InputStreamReader(System.in)) String next() {
          while (st == null || !st.hasMoreElements()) {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          return st.nextToken();
      } next {
          while (st == null || !st.hasMoreElements()) {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          return st.nextToken();
      } while (st == null || !st.hasMoreElements()) {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          } st == null || !st.hasMoreElements() st == null st null !st.hasMoreElements() st.hasMoreElements() st.hasMoreElements st {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          } try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              } catch (IOException e) {
                  e.printStackTrace();
              } IOException e {
                  e.printStackTrace();
              } e.printStackTrace() e.printStackTrace e {
                  st = new StringTokenizer(br.readLine());
              } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st int nextInt() {
          return Integer.parseInt(next());
      } nextInt {
          return Integer.parseInt(next());
      } return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next long nextLong() {
          return Long.parseLong(next());
      } nextLong {
          return Long.parseLong(next());
      } return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next double nextDouble() {
          return Double.parseDouble(next());
      } nextDouble {
          return Double.parseDouble(next());
      } return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next String nextLine(){
          String str = "";
    try {
       str = br.readLine();
    } catch (IOException e) {
       e.printStackTrace();
    }
    return str;
      } nextLine {
          String str = "";
    try {
       str = br.readLine();
    } catch (IOException e) {
       e.printStackTrace();
    }
    return str;
      } String str = ""; str "" try {
       str = br.readLine();
    } catch (IOException e) {
       e.printStackTrace();
    } catch (IOException e) {
       e.printStackTrace();
    } IOException e {
       e.printStackTrace();
    } e.printStackTrace() e.printStackTrace e {
       str = br.readLine();
    } str = br.readLine() str br.readLine() br.readLine br return str; str public class Main
{
 static Hashtable<String ,Integer>hash=new Hashtable<>();
  public static void main(String args[]) throws java.lang.Exception
  {
    MyScanner sc = new MyScanner();
  
     //  hash=new Hashtable<>();

    int n=Integer.parseInt(sc.nextLine());
    long c=0;
    for(int k=1;k<=n;k++)
    {
      if(k%3==0 || k%5==0){}
        else{c+=(long)k;}
    }
    System.out.println(c);
      
       
     
     
   }
     
  
  

  
  } public class Main
{
 static Hashtable<String ,Integer>hash=new Hashtable<>();
  public static void main(String args[]) throws java.lang.Exception
  {
    MyScanner sc = new MyScanner();
  
     //  hash=new Hashtable<>();

    int n=Integer.parseInt(sc.nextLine());
    long c=0;
    for(int k=1;k<=n;k++)
    {
      if(k%3==0 || k%5==0){}
        else{c+=(long)k;}
    }
    System.out.println(c);
      
       
     
     
   }
     
  
  

  
  } Main
import java.util.*;
import java.io.*;
public class Main
{
 static Hashtable<String ,Integer>hash=new Hashtable<>();
  public static void main(String args[]) throws java.lang.Exception
  {
    MyScanner sc = new MyScanner();
  
     //  hash=new Hashtable<>();

    int n=Integer.parseInt(sc.nextLine());
    long c=0;
    for(int k=1;k<=n;k++)
    {
      if(k%3==0 || k%5==0){}
        else{c+=(long)k;}
    }
    System.out.println(c);
      
       
     
     
   }
     
  
  

  
  }

   class MyScanner {
      BufferedReader br;
      StringTokenizer st;
 
      public MyScanner() {
         br = new BufferedReader(new InputStreamReader(System.in));
      }
 
      String next() {
          while (st == null || !st.hasMoreElements()) {
              try {
                  st = new StringTokenizer(br.readLine());
              } catch (IOException e) {
                  e.printStackTrace();
              }
          }
          return st.nextToken();
      }
 
      int nextInt() {
          return Integer.parseInt(next());
      }
 
      long nextLong() {
          return Long.parseLong(next());
      }
 
      double nextDouble() {
          return Double.parseDouble(next());
      }
 
      String nextLine(){
          String str = "";
    try {
       str = br.readLine();
    } catch (IOException e) {
       e.printStackTrace();
    }
    return str;
      }
 
   }