What will be the output of the following C# code?

interface i1
{
    void f1();
}
interface i2 :i1
{
    void f2();
}
public class maths :i2
{
    public void f2()
    {
        Console.WriteLine("fun2");
    }
    public void f1()
    {
        Console.WriteLine("fun1");
    }
}
class Program
{
    static Void Main()
    {
        maths m = new maths();
        m.f1();
        m.f2();
    }
}