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