import java.util.Scanner;

public class Main {
    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);

        Long inputNum = Long.parseLong(sc.next());
        Long sum = 0L;

        for(int i = 1; i <= inputNum; i++) {
            if(i % 3 == 0 && i % 5 == 0) {
                continue;
            } else if(i % 3 == 0) {
                continue;
            } else if(i % 5 == 0) {
                continue;
            } else {
                sum += i;
            }
        }

        System.out.println(sum);
        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