import java.util.*;
public class Main{
public static void main(String[]args){
Scanner sc=new Scanner(System.in);
  long t=sc.nextLong();
  long total=0;
 for(long i=0;i<=t;i++){
  	if(i%3==0 || i%5==0){
    continue;
    }
    else{
    total+=i;
    }
  }
  System.out.println(total);
}
} import java.util.*; util.* java public class Main{
public static void main(String[]args){
Scanner sc=new Scanner(System.in);
  long t=sc.nextLong();
  long total=0;
 for(long i=0;i<=t;i++){
  	if(i%3==0 || i%5==0){
    continue;
    }
    else{
    total+=i;
    }
  }
  System.out.println(total);
}
} Main public static void main(String[]args){
Scanner sc=new Scanner(System.in);
  long t=sc.nextLong();
  long total=0;
 for(long i=0;i<=t;i++){
  	if(i%3==0 || i%5==0){
    continue;
    }
    else{
    total+=i;
    }
  }
  System.out.println(total);
} main {
Scanner sc=new Scanner(System.in);
  long t=sc.nextLong();
  long total=0;
 for(long i=0;i<=t;i++){
  	if(i%3==0 || i%5==0){
    continue;
    }
    else{
    total+=i;
    }
  }
  System.out.println(total);
} Scanner sc=new Scanner(System.in); sc new Scanner(System.in) long t=sc.nextLong(); t sc.nextLong() sc.nextLong sc long total=0; total 0 for(long i=0;i<=t;i++){
  	if(i%3==0 || i%5==0){
    continue;
    }
    else{
    total+=i;
    }
  } long i=0; long i=0; i 0 i<=t i t i++ i++ i {
  	if(i%3==0 || i%5==0){
    continue;
    }
    else{
    total+=i;
    }
  } {
  	if(i%3==0 || i%5==0){
    continue;
    }
    else{
    total+=i;
    }
  } if(i%3==0 || i%5==0){
    continue;
    }
    else{
    total+=i;
    } i%3==0 || i%5==0 i%3==0 i%3 i 3 0 i%5==0 i%5 i 5 0 {
    continue;
    } continue; {
    total+=i;
    } total+=i total i System.out.println(total) System.out.println System.out System System.out total String[]args args public class Main{
public static void main(String[]args){
Scanner sc=new Scanner(System.in);
  long t=sc.nextLong();
  long total=0;
 for(long i=0;i<=t;i++){
  	if(i%3==0 || i%5==0){
    continue;
    }
    else{
    total+=i;
    }
  }
  System.out.println(total);
}
} public class Main{
public static void main(String[]args){
Scanner sc=new Scanner(System.in);
  long t=sc.nextLong();
  long total=0;
 for(long i=0;i<=t;i++){
  	if(i%3==0 || i%5==0){
    continue;
    }
    else{
    total+=i;
    }
  }
  System.out.println(total);
}
} Main
import java.util.*;
public class Main{
public static void main(String[]args){
Scanner sc=new Scanner(System.in);
  long t=sc.nextLong();
  long total=0;
 for(long i=0;i<=t;i++){
  	if(i%3==0 || i%5==0){
    continue;
    }
    else{
    total+=i;
    }
  }
  System.out.println(total);
}
}
