|시간 제한||메모리 제한||제출||정답||맞은 사람||정답 비율|
|7 초||512 MB||103||32||30||33.333%|
Paul is an extremely gifted computer scientist who just completed his master’s degree at a prestigious German university. Now he would like to culminate his academic career in a PhD. The problem is that there are so many great universities out there that it is hard for him to pick the best. Because some application deadlines are coming up soon, Paul’s only way to procrastinate his decision is by simply applying to all of them.
Most applications require Paul to attach a portrait photo. However, it seems like there does not exist an international standard for the aspect ratio of these kinds of photos. While most European universities ask Paul to send a photograph with aspect ratio 4.5 by 6, some Asian countries discard the applications immediately if the photo does not have an aspect ratio of 7.14 by 11.22, precisely.
As Paul has never been interested in photo editing, he never had a reason to spend a lot of money on proper software. He downloaded a free trial version some months ago, but that version has already expired and now only works with some funny restrictions. The cropping tool, for example, no longer accepts arbitrary numbers for setting the aspect ratio, but only primes. This makes Paul wonder whether the desired aspect ratios can even be properly expressed by two prime numbers. Of course, in case this is possible, he would also like to know the primes he has to enter.
The input consists of:
All real numbers are given with at most 5 decimal places after the decimal point.
For each application, if it is possible to represent the desired aspect ratio by two prime numbers p and q, output one line with p and q. Otherwise, output impossible. If multiple solutions exist, output the one minimizing p + q.
3 4.5 6 7.14 11.22 0.00002 0.00007
impossible 7 11 2 7