import java.util.Scanner;

public class Main {
	private static long fizzbuzzSum(int number) {
		long sum = 0;
		for (int i = 1; i <= number; i++) {
			if (i % 3 != 0 && i % 5 != 0)
				sum += i;
		}
		return sum;
	}

	public static void main(String[] args) {
		try (Scanner scanner = new Scanner(System.in)) {
			System.out.println(fizzbuzzSum(scanner.nextInt()));
		}
	}
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz