import java.util.Scanner;
public class Main {
    public static void main(String[] args) throws Exception {
        Scanner stdIn= new Scanner(System.in);
        int x = stdIn.nextInt();
        long a=0;
        for(int i=1;i<=x;i++){
            if(i%3==0||i%5==0)continue;
            a=a+i;
        }
        System.out.println(a);
    }
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) throws Exception {
        Scanner stdIn= new Scanner(System.in);
        int x = stdIn.nextInt();
        long a=0;
        for(int i=1;i<=x;i++){
            if(i%3==0||i%5==0)continue;
            a=a+i;
        }
        System.out.println(a);
    }
} Main public static void main(String[] args) throws Exception {
        Scanner stdIn= new Scanner(System.in);
        int x = stdIn.nextInt();
        long a=0;
        for(int i=1;i<=x;i++){
            if(i%3==0||i%5==0)continue;
            a=a+i;
        }
        System.out.println(a);
    } main {
        Scanner stdIn= new Scanner(System.in);
        int x = stdIn.nextInt();
        long a=0;
        for(int i=1;i<=x;i++){
            if(i%3==0||i%5==0)continue;
            a=a+i;
        }
        System.out.println(a);
    } Scanner stdIn= new Scanner(System.in); stdIn new Scanner(System.in) int x = stdIn.nextInt(); x stdIn.nextInt() stdIn.nextInt stdIn long a=0; a 0 for(int i=1;i<=x;i++){
            if(i%3==0||i%5==0)continue;
            a=a+i;
        } int i=1; int i=1; i 1 i<=x i x i++ i++ i {
            if(i%3==0||i%5==0)continue;
            a=a+i;
        } {
            if(i%3==0||i%5==0)continue;
            a=a+i;
        } if(i%3==0||i%5==0)continue; i%3==0||i%5==0 i%3==0 i%3 i 3 0 i%5==0 i%5 i 5 0 continue; a=a+i a a+i a i System.out.println(a) System.out.println System.out System System.out a String[] args args public class Main {
    public static void main(String[] args) throws Exception {
        Scanner stdIn= new Scanner(System.in);
        int x = stdIn.nextInt();
        long a=0;
        for(int i=1;i<=x;i++){
            if(i%3==0||i%5==0)continue;
            a=a+i;
        }
        System.out.println(a);
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        Scanner stdIn= new Scanner(System.in);
        int x = stdIn.nextInt();
        long a=0;
        for(int i=1;i<=x;i++){
            if(i%3==0||i%5==0)continue;
            a=a+i;
        }
        System.out.println(a);
    }
} Main
import java.util.Scanner;
public class Main {
    public static void main(String[] args) throws Exception {
        Scanner stdIn= new Scanner(System.in);
        int x = stdIn.nextInt();
        long a=0;
        for(int i=1;i<=x;i++){
            if(i%3==0||i%5==0)continue;
            a=a+i;
        }
        System.out.println(a);
    }
}
