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TimeLimit:1000ms MemoryLimit:128000KB

64-bit integer IO format:%lld

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Problem Description

Xiaoming is busy writing novels and playing basketball recently. Nowadays he failed in math, so he tried his best to review his lessons starts by answering problems.

The accuracy of the each problem is fixed. Now the question is how many questions xiaoming can answer successfully.

Input

The first line of date is an integer T, which is the number of the test cases.

Then T cases follow, each case starts with an integer N, which stands for the number of the problems. The next line has N float numbers, which stands for xiaoming’s accuracy for each problem.(T<=100,N<=10)

Output

For each case, you should output the expect number of problems xiaoming can answer, accurate up to 4 decimal places.

SampleInput

SampleOutput

Case 1: 0.5000
Case 2: 1.0000

Submit

题目统计信息详细


总AC数	42
通过人数	40
尝试人数	43
总提交量	71
AC率	56.34%

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出处

【FJUT】第三届新生赛真题

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