#include <iostream>

 #include <cstdio>

 #include <algorithm>

 #include <cmath>

 #include <iomanip>

 using namespace std;

 #define pi acos(-1.0)

 double h;

 double cal(double a) {

     return pi * cos(a) - a * cos(a) + sin(a) - pow(sin(a), ) / ;

 }

 double calV(double b) {

     double a = acos( * tan(b) - 1.0);

     return (cal(a) - cal(pi)) / tan(b);

 }

 int main()

 {

     int T;

     scanf("%d", &T);

     while(T--) {

         scanf("%lf", &h);

         double v = pi * h;

         if(h < 1e-)

             printf("0.00000\n");

         else if(h >= 1.0) {

             double a = atan(2.0 - h);

             printf("%.5f\n", pi / cos(a));

         }

         else {

             double l = , r = pi / ;

             while(r - l > 1e-) {

                 double m = (l + r) / ;

                 if(calV(m) < v)

                     l = m;

                 else

                     r = m;

             }

             double x =  * tan(r);

             double a = acos(x - );

             double s = (pi - a + sin(a) * cos(a)) / sin(r);

             printf("%.5f\n", s);

         }

     }

     return ;

 }