CoinPurse.java

import java.io.*;
import java.util.*;

public class CoinPurse {
    private int amount;
    public void addTo(Coin c) {
	amount = amount + c.getValue();
    }
    public void removeFrom(Coin c) {
	amount = amount - c.getValue();
    }
    public int getAmount() {
	return amount;
    }

}