class SharpPencil{
private int width;
int amount;
public int getAmount() {return amount;}
public void setAmount(int amount) {this.amount=amount;}
}
class BallPen extends SharpPencil{
String color;
public int getAmount() {return amount;}
public void setAmount(int amount) {this.amount=amount;}
public String getColor() {return color;}
public void setColor(String color) {this.color=color;}
}
class FountainPen extends BallPen{
public int getAmount() {return amount; }
public void setAmount(int amount) {this.amount=amount; }
public String getColor() {return color; }
public void setColor(String color ) {this.color=color; }
public void refill(int n) {amount=n; }
}