hdoj2011

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
    int m;
    cin >> m;
    while(m--)
    { int n;
      cin >> n;
      double s = 0;
      int k = -1;
      for(int i = 1; i<=n; i++)
      {
              double t = 1.0 / i ;
              k = -1 * k;
              s += k * t ;
          
              }
               printf("%.2f",s);    
               cout << endl;  
      
              }
}