ambiguous question
if you mean what is pi (to 50 digits)?
google-it ...
3.14159265358979323846264338327950288419716939937510
use an online calculator ...
http://www.miniwebtool.com/first-n-digits-of-pi/?number=50
calculate it using some formula from here
http://mathworld.wolfram.com/PiFormulas.html
