
import java.util.*;
import java.lang.*;

public class Main {
    public static void main(String[] args) {
        //コード
        Scanner scanner = new Scanner(System.in);
        int n = Integer.parseInt(scanner.next());

        // 合計値
        List<Integer> total = new ArrayList<Integer>();

        long sum = 0L;

        for (int i =0; i <= n; i++) {
            boolean fizz = i % 3  == 0;
            boolean buzz =  i % 5 == 0;
            if (fizz || buzz)  continue;

            fizz = false;
            buzz = false;
            sum += i;
        }



        System.out.println(sum);
    }
}
/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