What will be the output of the following code?

What will be the output of the following code?

class Base {
    protected int value = 10;
}

class Derived : Base {
    public int GetValue() {
        return value;
    }
}

class Program {
    static void Main() {
        Derived d = new Derived();
        System.Console.WriteLine(d.GetValue());
    }
}