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

Input: Consider Input: Problem: 2,7 , 17,3 , 11,19 , 5,13 , __

Output: 23


Input: Consider Input: Problem: a man have 8 t - shirt and some pant . he can dress in 72 ways . then tell me the no . of pant that man have .

Output: 9


Input: Consider Input: Problem: a student committee on academic integrity has 132 ways to select a president and vice president from a group of candidates . the same person can not be both president and vice president . how many candidates are there ?


Output: 1