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- ProjectEuler+
- Project Euler #40: Champernowne's constant

# Project Euler #40: Champernowne's constant

# Project Euler #40: Champernowne's constant

_{This problem is a programming version of Problem 40 from projecteuler.net}

An irrational decimal fraction is created by concatenating the positive integers:

It can be seen that the digit of the fractional part is 1.

If represents the digit of the fractional part, find the value of the following expression.

**Input Format**

First line contains that denotes the number of test cases. This is followed by lines, each containing an integers.

**Constraints**

**Output Format**

Print the answer corresponding to the test case.

**Sample Input**

```
1
1 2 3 4 5 6 7
```

**Sample Output**

```
5040
```