Question 177
Petryk programmed calculator in such a way that if there is number $x$ on the screen and then the button «$\Rightarrow$» is pressed, number $\frac{x-1}{x+1}$ appears on the screen. Petryk pressed the button «$\Rightarrow$» 2014 times, and then 2016 appeared on the screen. What number was on the screen at the beginning? The screen can show not only integer numbers.