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C. Jeff and Brackets

time limit per test

1 secondmemory limit per test

256 megabytesinput

standard inputoutput

standard outputJeff loves regular bracket sequences.

Today Jeff is going to take a piece of paper and write out the regular bracket sequence, consisting of *nm* brackets. Let's number all brackets of this sequence from 0 to *nm* - 1 from left to right. Jeff knows that he is going to spend *a* _{ i mod n} liters of ink on the *i*-th bracket of the sequence if he paints it opened and *b* _{ i mod n} liters if he paints it closed.

You've got sequences *a*, *b* and numbers *n*, *m*. What minimum amount of ink will Jeff need to paint a regular bracket sequence of length *nm*?

Operation *x* *mod* *y* means taking the remainder after dividing number *x* by number *y*.

Input

The first line contains two integers *n* and *m* (1 ≤ *n* ≤ 20; 1 ≤ *m* ≤ 10^{7}; *m* is even). The next line contains *n* integers: *a* _{0}, *a* _{1}, ..., *a* _{ n - 1} (1 ≤ *a* _{ i} ≤ 10). The next line contains *n* integers: *b* _{0}, *b* _{1}, ..., *b* _{ n - 1} (1 ≤ *b* _{ i} ≤ 10). The numbers are separated by spaces.

Output

In a single line print the answer to the problem — the minimum required amount of ink in liters.

Examples

Input

2 6

1 2

2 1

Output

12

Input

1 10000000

2

3

Output

25000000

Note

In the first test the optimal sequence is: ()()()()()(), the required number of ink liters is 12.

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