The task is to generate the correct answer for a given math problem.

Input: Consider Input: Problem: the average of first six prime numbers greater than 20 is ?

Output: 3


Input: Consider Input: Problem: zachary is helping his younger brother , sterling , learn his multiplication tables . for every question that sterling answers correctly , zachary gives him 3 pieces of candy . for every question that sterling answers incorrectly , zachary takes away two pieces of candy . after 6 questions , if sterling had answered 2 more questions correctly , he would have earned 31 pieces of candy . how many of the 6 questions did zachary answer correctly ?

Output: 7


Input: Consider Input: Problem: if a number n is chosen at random from the set of two - digit integers whose digits are both prime numbers , what is the probability e that n is divisible by 3 ?


Output: 5 / 16