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Arrange Goodies

^{Section: 2, Score: 19, Time limit per test: 30 seconds, Memory limit per test: 512MB, Input: stdin, Output: stdout}

When an employee joins Agoda, they receive a box containing a set number of goodies, each with a value tag attached. All boxes are equivalent and contain an equal number of goodies.

However, on one occasion, the delivery team makes a mistake and sends two boxes with an equal number of goodies, but with different values.

You are given the task of making both the boxes equivalent with the following operation:

Choose two indices $i$ and $j$ and swap the $i^{th}$ goodie of box1 with the $j^{th}$ goodie of box2. The cost of the swap is $min(box1[i],box2[j])$.

Two goodies are equivalent if they have the same value. Two boxes are equivalent if for every goodie in the first box, there is a unique equivalent goodie in the second box.

Help calculate the minimum cost to make the boxes equivalent.

Input Format

The first line contains an integer $N$, the number of goodies in each box.

The next line contains $N$ space-separated integers, value of goodies in box1.

The next line contains $N$ space-separated integers, value of goodies in box2.

Constraints

$1\le N\le {10}^5$

$1\le box{1}_i,box{2}_i\le {10}^9,$ for $1\le i\le N$

Output Format

Print the minimum cost to make the boxes equivalent. If it is not possible to make both boxes equivalent, print -1.

Sample Input

4
4 2 2 2
1 4 1 2

Sample Output

1

Explanation

Swap index 1 of box1 with index 0 of box2, which has cost 1. Now box1 = [4,1,2,2] and box2 = [2,4,1,2]. Rearranging both the boxes makes them equal.

Sample Input

4
2 3 4 1
3 2 5 1

Sample Output

-1