import java.util.Scanner;
public class Main
{
    public static void main(String[]args)
    {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        long sumatoria=0;
        for(int i=0;i<=n;i++)
        {
          if((i%3!=0)&&(i%5!=0))
          sumatoria = sumatoria+i;
         }
        System.out.print(sumatoria);
    }
}
/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