import javax.swing.text.Element;
import javax.swing.text.DefaultStyledDocument.ElementSpec;

class Main {
  public static void main(String[] args) {
    //关于分支结构的一种例题:if elseif的Demo
    double price = 300;
    if(price>=2000){
      price*=0.5;
    }else if(price>=1000){
      price*=0.7;
    }else if(price>=500){
      price*=0.8;
    }else {
      price*=0.9;
    }
    System.out.println("最终的消费金额为"+price);
    
  }
}