import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

class Main {

    public static void main(String[] args) throws Exception {

        try {

            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

            long count = Integer.parseInt(br.readLine());
            List<Long> numberList = new ArrayList<>();
            for (long i = 1; i <= count; i++) {
                if (i % 3 == 0 && i % 5 == 0) {
                    continue;
                } else if (i % 3 == 0) {
                    continue;
                } else if (i % 5 == 0) {
                    continue;
                } else {
                    numberList.add(i);
                }
            }

            long result = 0;
            for (long number : numberList) {
                result = result + number;
            }
            System.out.println(result);
        } catch (IOException | NumberFormatException e) {
            e.printStackTrace();
            System.exit(0);
        } catch (final Exception e) {
            e.printStackTrace();
            System.exit(0);
        }
    }
}
/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