Sorry Bhinazu, You are off by 56.54%. It does not look as simple as the way you do it. Have to think little more. About the question you asked earlier, I thought that Conditions: If a girl is in the different side that of her BF, she will be kissed by the other boys even if they are with their GFs. meant that the guys cannot kiss the ladies if they are to go at the very same moment. Let me put you in more mathematical term: what I meant was at the instant when Bb get off the boat, a takes on the boat. So that the guy would not be able to kiss the lady.  Anyway, if you really think that there is some other secured way, I can?t think on top of my head right now. Will post it later, if I come up with a better answer. No problem, confused.