AT_abc400_a [ABC400A] ABC400 Party

In the ceremony commemorating ABC400, we want to arrange $ 400 $ people in a rectangular formation of $ A $ rows and $ B $ columns without any gaps. You are given a positive integer $ A $ . Print the value of a positive integer $ B $ for which such an arrangement is possible. If there is no such positive integer $ B $ , print $ -1 $ .

The input is given from Standard Input in the following format: > $ A $

Print the value of $ B $ or $ -1 $ as specified by the problem statement.

### Sample Explanation 1 We can arrange $ 400 $ people in $ 10 $ rows and $ 40 $ columns. ### Constraints - $ A $ is an integer between $ 1 $ and $ 400 $ , inclusive.