Online JudgeProblem SetAuthorsOnline ContestsUser
Web Board
Home Page
F.A.Qs
Statistical Charts
Problems
Submit Problem
Online Status
Prob.ID:
Register
Update your info
Authors ranklist
Current Contest
Past Contests
Scheduled Contests
Award Contest
User ID:
Password:
  Register
Language:
Expectation
Time Limit: 1000MSMemory Limit: 65536K
Total Submissions: 1172Accepted: 568Special Judge

Description

Eric has constructed an easy scheme for generating random integer numbers. His scheme inputs an integer n and generates evenly distributed random integer value between 0 and (n − 1) inclusive. For example, if n = 3, the scheme generates 0, 1 or 2, each with probability 1/3.

Now Eric is planning to construct more complicated schemes. The first one will consist of two independent random generators with their outputs forwarded to his favorite XOR gate, which does bitwise exclusive or with its two inputs.

Eric’s friend Nick studies math. Nick said that the scheme is very interesting, and the most interesting thing is the expectation of the result. Now they both think how to calculate the expectation. Could you help them?

Remember that the expectation of the random variable is its average value. For a variable ξ with nonnegative integer values it can be calculated as

,

where pi is the probability of ξ being equal to i.

Input

The first line of the input contains the number k of cases to solve (1 ≤ k ≤ 1 000). Each case consists of a single integer 1 ≤ n ≤ 109 on a separate line.

Output

For each case output the expected value of the new Eric’s scheme with at least two digits after the decimal point. Output each result on a separate line.

Sample Input

2
3
4

Sample Output

1.33
1.50

Source

Northeastern Europe 2005, Northern Subregion

[Submit]   [Go Back]   [Status]   [Discuss]

Home Page   Go Back  To top


All Rights Reserved 2003-2013 Ying Fuchen,Xu Pengcheng,Xie Di
Any problem, Please Contact Administrator