public static void Main()
{
var rootDoll = new MatryoshkaDoll();
var outerDoll1 = new MatryoshkaDoll(rootDoll);
var outerDoll2 = new MatryoshkaDoll(outerDoll1);
var outerDoll3 = new MatryoshkaDoll(outerDoll2);
Console.WriteLine("Smaller dolls = " + outerDoll3.GetNumberOfSmallerDolls());
}
public MatryoshkaDoll(MatryoshkaDoll containedDoll)
{
_containedDoll = containedDoll;
}