import java.io.*;
import java.util.*;
public class Coinpurse{
private double amount;
public void setPurse(){
amount = 0;
}
public void setPurse(double amount){
amount = amount;
}
public void addCoin(Coin c){
amount = c.getAmount() + amount;
}
public void removeCoin(Coin c){
amount = amount - c.getAmount();
}
public double getAmount(){
return amount;
}
}