
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner scanner = new Scanner(System.in);
		String n = scanner.nextLine();
		long result = 0;
		String[] fizzList = new String[Integer.parseInt(n)];

		for(int i = 1; i <= Integer.parseInt(n); i++) {
			if(i % 3 == 0 && i % 5 ==0) {
				fizzList[i - 1] = "FizzBuzz";
			}else if(i % 3 == 0){
				fizzList[i - 1] = "Fizz";
			}else if(i % 5 == 0){
				fizzList[i - 1] = "Buzz";
			}else {
				fizzList[i - 1] = String.valueOf(i);
				result += i;
			}
		}

		System.out.println(result);

	}

}

/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