import java.util.*;

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

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