I didn't understand the problem properly at first, i thought the sum
of the flight number at one airport must be prime number. So i worte
a 200 lines prog. which the judge function is so strict that it won't
give an answer in 5s on the last one or two test data. Then i do the
optimization work here and there , but of couse it won't work.
Finally , i got AC!!!!!!!!!!!

isn't it enough to simply print the first m prime numbers ?
since gcd of any prime numbers is 1.

> isn't it enough to simply print the first m prime numbers ?
> since gcd of any prime numbers is 1.
>