
import java.util.ArrayList;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		ArrayList<Integer>array = new ArrayList<Integer>();
		long ans = 0;

		for(int i=1; i<=N; i++) {
			if( !(i%3==0 || i%5==0) ){
				array.add(i);
			}
		}
		for(int i=0; i<array.size(); i++) {
			ans += array.get(i);
		}

		System.out.println(ans);

		sc.close();

	}

}

/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