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

public class Main {
    public static void main(String[] args) {
    	MyScanner sc = new MyScanner();
   		int num=Integer.parseInt(sc.nextLine());
		long te = 0;
      	for(int i = 0;i<=num;i++){
          if(!(i%3==0) && !(i%5==0)){
             te += i;
          }
        }
      	System.out.println(te);
    }
}

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 {
    public static void main(String[] args) {
    	MyScanner sc = new MyScanner();
   		int num=Integer.parseInt(sc.nextLine());
		long te = 0;
      	for(int i = 0;i<=num;i++){
          if(!(i%3==0) && !(i%5==0)){
             te += i;
          }
        }
      	System.out.println(te);
    }
} Main public static void main(String[] args) {
    	MyScanner sc = new MyScanner();
   		int num=Integer.parseInt(sc.nextLine());
		long te = 0;
      	for(int i = 0;i<=num;i++){
          if(!(i%3==0) && !(i%5==0)){
             te += i;
          }
        }
      	System.out.println(te);
    } main {
    	MyScanner sc = new MyScanner();
   		int num=Integer.parseInt(sc.nextLine());
		long te = 0;
      	for(int i = 0;i<=num;i++){
          if(!(i%3==0) && !(i%5==0)){
             te += i;
          }
        }
      	System.out.println(te);
    } MyScanner sc = new MyScanner(); sc new MyScanner() int num=Integer.parseInt(sc.nextLine()); num Integer.parseInt(sc.nextLine()) Integer.parseInt Integer sc.nextLine() sc.nextLine sc long te = 0; te 0 for(int i = 0;i<=num;i++){
          if(!(i%3==0) && !(i%5==0)){
             te += i;
          }
        } int i = 0; int i = 0; i 0 i<=num i num i++ i++ i {
          if(!(i%3==0) && !(i%5==0)){
             te += i;
          }
        } {
          if(!(i%3==0) && !(i%5==0)){
             te += i;
          }
        } if(!(i%3==0) && !(i%5==0)){
             te += i;
          } !(i%3==0) && !(i%5==0) !(i%3==0) (i%3==0) i%3 i 3 0 !(i%5==0) (i%5==0) i%5 i 5 0 {
             te += i;
          } te += i te i System.out.println(te) System.out.println System.out System System.out te 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 {
    public static void main(String[] args) {
    	MyScanner sc = new MyScanner();
   		int num=Integer.parseInt(sc.nextLine());
		long te = 0;
      	for(int i = 0;i<=num;i++){
          if(!(i%3==0) && !(i%5==0)){
             te += i;
          }
        }
      	System.out.println(te);
    }
} public class Main {
    public static void main(String[] args) {
    	MyScanner sc = new MyScanner();
   		int num=Integer.parseInt(sc.nextLine());
		long te = 0;
      	for(int i = 0;i<=num;i++){
          if(!(i%3==0) && !(i%5==0)){
             te += i;
          }
        }
      	System.out.println(te);
    }
} Main
import java.util.*;
import java.io.*;

public class Main {
    public static void main(String[] args) {
    	MyScanner sc = new MyScanner();
   		int num=Integer.parseInt(sc.nextLine());
		long te = 0;
      	for(int i = 0;i<=num;i++){
          if(!(i%3==0) && !(i%5==0)){
             te += i;
          }
        }
      	System.out.println(te);
    }
}

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;
      }
 
   }