A good plan Captain I thought, but, your friend still needs to eat! Then I realised that his cunning plan to hold a referendum on a Sunday could have been triggered by this story:
https://www.biblegateway.com/passage?search=John+6:1-14
Then I thought why not apply this to the Greeks predicament and they would not go hungry.
So with the Greek population being rather more than five thousand Mr Tsipras could perhaps find a way to increase the amount of fish and loaves of bread proportionately to the population of Greece.
This is the current situation of Greece's population.
http://countrymeters.info/en/Greece
..................you do the maths!