import java.util.*;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        //System.out.println(a);
        
        //int b = sc.nextInt();
        long temp = 0;
        for(long i=1; i <= a ; i++) {
            if( i%3 == 0 || i%5 == 0 || i%15 == 0){
            }else{
                temp = temp + i;
                //System.out.println(i);
            }
        }
        //System.out.println(String.format("%d",(int)temp));
        System.out.println(temp);

    }
}
/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