class Approver {
  constructor(name) { this.name = name; this.next = null; }
  setNext(approver) { this.next = approver; return approver; }
  processRequest(amount) { throw new Error("구현 필요"); }
}

class Manager extends Approver {
  processRequest(amount) {
    if (amount <= 1000) console.log(`${this.name}이(가) $${amount} 결제 승인`);
    else if (this.next) this.next.processRequest(amount);
  }
}

class Director extends Approver {
  processRequest(amount) {
    if (amount <= 5000) console.log(`${this.name}이(가) $${amount} 결제 승인`);
    else if (this.next) this.next.processRequest(amount);
  }
}

class CEO extends Approver {
  processRequest(amount) {
    if (amount <= 10000) console.log(`${this.name}이(가) $${amount} 결제 승인`);
    else console.log(`$${amount}은(는) 이사회 승인이 필요합니다.`);
  }
}

const manager = new Manager("팀장");
const director = new Director("본부장");
const ceo = new CEO("대표이사");

manager.setNext(director).setNext(ceo);

manager.processRequest(500);
manager.processRequest(3000);
manager.processRequest(8000);
manager.processRequest(15000);