Time for my fourth currency

As I get ready to leave Salzburg and head to Cesky Krumlov, I am doing my ritual changing of the currency.  Whenever I travel internationally, I keep small ziplock bags in my backpack of the different currencies and as I am on the plane, I pull out the currency from where I came and swap it with where I am going.  So far, I started in US dollars, then went to Turkish Lira, next were Euros and now I am changing to Czech Krona.  This is probably the hardest, as the exchange rate is the most different.  Lira were about 2.5 to 1, the Euro is about 1.1 to 1, but the Czech Krona is about 24:1, so a 500 Krona bill is worth about $20.