Aug 19, 2016, 14:3208/19/16
"One of the commanders to guess the right answer"
What do you think the chances are that anybody will guess the right answer?
So we have to pick a number between zero and infinity with decreasing nonzero probability as we move past 10,000 or so. They did this in a previous contest, got cheap and just said that nobody had guessed the right answer so nobody won crystals.
I guess I'll just go with 1000.