import java.util.Scanner;
public class Main {
    static Scanner sc = new Scanner(System.in);
 
    public static void main(String[] args) {
        long N = sc.nextLong();
        long sum = 0;
        for (long i = 1; i <= N; i++) {
            if(i%15 != 0 && i%3 != 0 && i%5 !=0){
              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