UnixGo
Мастерство приходит только с практикой.

Multi-vitamin

Getting out of the restricted shell shouldn’t take you more than five minutes. Then have a look at /rdx/multivitamin. Try to analyse the algorithm very carefully. There is a weakness that really speeds up your quest…\

Multiplication is easy, and so is division…? You might want to look at http://gmplib.org/ if you use c.

Included file: semtex7.c