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

Input: Consider Input: Problem: the sum of the even numbers between 1 and n is 89 * 90 , where n is an odd number , then n = ?

Output: 179


Input: Consider Input: Problem: in a forest 150 deer were caught , tagged with electronic markers , then released . a week later , 50 deer were captured in the same forest . of these 50 deer , it was found that 20 had been tagged with the electronic markers . if the percentage of tagged deer in the second sample approximates the percentage of tagged deer in the forest , and if no deer had either left or entered the forest over the preceding week , what is the approximate number of deer in the forest ?

Output: 6,000


Input: Consider Input: Problem: a certain sum is invested at simple interest at 18 % p . a . for two years instead of investing at 12 % p . a . for the same time period . therefore the interest received is more by rs . 300 . find the sum ?


Output: 2500