import java.util.*;
public class Main {// Main
    public static void main(String[] args){
       	Scanner s = new Scanner(System.in);
        long a = s.nextLong();
        long count = 0;
        for(int i=1;i<=a;i++) {
            if(i % 3 == 0 && i % 5 == 0) {

            } else if(i % 3 == 0) {

            } else if(i % 5 == 0) {

            } else {
                count += i;
            }
        }
        System.out.println(count);
    }
}

/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