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

Input: Consider Input: Problem: virginia , adrienne , and dennis have taught history for a combined total of 96 years . if virginia has taught for 9 more years than adrienne and for 12 fewer years than dennis , for how many years has dennis taught ?

Output: 4


Input: Consider Input: Problem: a is half good a work man as b and together they finish a job in 14 days . in how many days working alone b finish the job ?

Output: 21


Input: Consider Input: Problem: ashok secured average of 74 marks in 6 subjects . if the average of marks in 5 subjects is 74 , how many marks did he secure in the 6 th subject ?


Output: 74