Contrary to popular belief, the number 13 is a lucky number.
Your task is to implement a method to see if together
b are lucky. Your method should return
true if either
b or both are equal to 13 or the sum of
b is 13.
lucky13( 13, 88 ) => true lucky13( 0, 13 ) => true lucky13( 10, 3 ) => true lucky13( 9, 3 ) => false