Description
Given an Integer n , please sum over i = 0 to n as an approximation of pi .
Namely ,
Input
The first line contains a integer M, indicating the number of testcases.
The following lines are testcases.
Each testcase contains an integer "n" ,which indicate you have to sum over i = 0 to n,
where 0<= n <=100
Output
A floating number with the format : "%.10f\n"