import java.text.DecimalFormat;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        double cnt = 0;
        for (int i = 1; i <= n; ++i) {
            if (i % 3 != 0 && i % 5 != 0)
                cnt += i;
        }
        DecimalFormat ft = new DecimalFormat("####");
        System.out.print(ft.format(cnt));
    }
}

/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