public static void Main()
{
Approver teamLead = new TeamLead();
Approver vicePresident = new VicePresident();
Approver president = new President();
teamLead.SetNext(vicePresident);
vicePresident.SetNext(president);
var purchase = new Purchase(350, 1);
teamLead.ProcessRequest(purchase);
purchase = new Purchase(24000, 2);
teamLead.ProcessRequest(purchase);
purchase = new Purchase(32590, 3);
teamLead.ProcessRequest(purchase);
purchase = new Purchase(100001, 4);
teamLead.ProcessRequest(purchase);
}