using System;

public class Test
{
	interface Foo {
		void Bar(int a, int b = 1);
	}
	class FooImpl : Foo {
		public void Bar(int a, int b) {
			Console.WriteLine("bar/2");
		}
		public void Bar(int a) {
			Console.WriteLine("bar/1");
		}
	}
	
	public static void Main()
	{
		Foo f1 = new FooImpl();
		f1.Bar(1);
		FooImpl f2 = new FooImpl();
		f2.Bar(1);
	}
}