public void findCostRecursively(Employee employee,int headCount){
        if(employee.getReportees()==null || employee.getReportees().size()==0){
            return;
        }
        else {
            costSaved += employee.getCostSavings(headCount);
            for (Employee e : employee.getReportees()) {
                findCostRecursively(e, headCount);
            }
        }
    }