class Playground {
    public static void main(String[ ] args) {
        // Exercise 3
        int bankBalance = 500;
        bankBalance += 250;
        bankBalance -= 100;
        System.out.println(bankBalance);
        
        // Exercise 5
        int day = 8;
        String month = "March";
        
        System.out.println("My birthday is " + day + " of " + month);
        
        // Exercise 6
        String firstName = "David";
        String lastName = "Alves";
        String fullName = firstName + " " + lastName;
        int letters = firstName.length() + lastName.length();
        System.out.println("Hi, my name is " + fullName + ". My name have " + letters + " letters.");
        
        // Exercise 7
        double f = 81;
        double c = (f - 32) * 5 / 9;
        System.out.println("The celsius value of " + f + " farenheit is " + c);
    }
}