You are an expert competitive programmer. You will be given a problem statement, test case constraints and example test inputs and outputs. Please reason step by step about the solution (that must respect memory and time limits), then provide a complete implementation in python3.

Your solution must read input from standard input (cin), write output to standard output (cout).
Do not include any debug prints or additional output.

Put your final solution within a single code block:
```python
<your code here>
```

Execution time limit: 1.0 seconds
Memory limit: 256.0 MB

# Problem
Polycarp is preparing the first programming contest for robots. There are $$$n$$$ problems in it, and a lot of robots are going to participate in it. Each robot solving the problem $$$i$$$ gets $$$p_i$$$ points, and the score of each robot in the competition is calculated as the sum of $$$p_i$$$ over all problems $$$i$$$ solved by it. For each problem, $$$p_i$$$ is an integer not less than $$$1$$$.

Two corporations specializing in problem-solving robot manufacturing, "Robo-Coder Inc." and "BionicSolver Industries", are going to register two robots (one for each corporation) for participation as well. Polycarp knows the advantages and flaws of robots produced by these companies, so, for each problem, he knows precisely whether each robot will solve it during the competition. Knowing this, he can try predicting the results — or manipulating them.

For some reason (which absolutely cannot involve bribing), Polycarp wants the "Robo-Coder Inc." robot to outperform the "BionicSolver Industries" robot in the competition. Polycarp wants to set the values of $$$p_i$$$ in such a way that the "Robo-Coder Inc." robot gets strictly more points than the "BionicSolver Industries" robot. However, if the values of $$$p_i$$$ will be large, it may look very suspicious — so Polycarp wants to minimize the maximum value of $$$p_i$$$ over all problems. Can you help Polycarp to determine the minimum possible upper bound on the number of points given for solving the problems?

## Input Format
The first line contains one integer $$$n$$$ ($$$1 \le n \le 100$$$) — the number of problems.

The second line contains $$$n$$$ integers $$$r_1$$$, $$$r_2$$$, ..., $$$r_n$$$ ($$$0 \le r_i \le 1$$$). $$$r_i = 1$$$ means that the "Robo-Coder Inc." robot will solve the $$$i$$$-th problem, $$$r_i = 0$$$ means that it won't solve the $$$i$$$-th problem.

The third line contains $$$n$$$ integers $$$b_1$$$, $$$b_2$$$, ..., $$$b_n$$$ ($$$0 \le b_i \le 1$$$). $$$b_i = 1$$$ means that the "BionicSolver Industries" robot will solve the $$$i$$$-th problem, $$$b_i = 0$$$ means that it won't solve the $$$i$$$-th problem.

## Output Format
If "Robo-Coder Inc." robot cannot outperform the "BionicSolver Industries" robot by any means, print one integer $$$-1$$$.

Otherwise, print the minimum possible value of $$$\max \limits_{i = 1}^{n} p_i$$$, if all values of $$$p_i$$$ are set in such a way that the "Robo-Coder Inc." robot gets strictly more points than the "BionicSolver Industries" robot.

## Examples
```input
5
1 1 1 0 0
0 1 1 1 1
```
```output
3
```
-----
```input
3
0 0 0
0 0 0
```
```output
-1
```
-----
```input
4
1 1 1 1
1 1 1 1
```
```output
-1
```
-----
```input
8
1 0 0 0 0 0 0 0
0 1 1 0 1 1 1 1
```
```output
7
```

## Note
In the first example, one of the valid score assignments is $$$p = [3, 1, 3, 1, 1]$$$. Then the "Robo-Coder" gets $$$7$$$ points, the "BionicSolver" — $$$6$$$ points.

In the second example, both robots get $$$0$$$ points, and the score distribution does not matter.

In the third example, both robots solve all problems, so their points are equal.

Now solve the problem and return the code.