public class LyyraCard {

    private double balance;

    public LyyraCard(double balanceAtStart) {
        balance += balanceAtStart;
    }

    public String toString() {
        return "The card has " + balance + " euros";
    }

    public void payEconomical() {

        balance -= 2.50;
        if (balance < 0) {
            balance += 2.50;
        }
    }

    public void payGourmet() {
        balance -= 4.00;
        if (balance < 0) {
            balance += 4.00;
        }
    }

    public void loadMoney(double amount) {
        if (amount >= 0) {
            balance += amount;
        }

        if (balance > 150) {
            balance = 150;
        }
    }