you are given 2 arrays of size N.

Each array contains numbers from 1 to N ( no repetition)

We define 1 operation by :

1- you can pick any number from the array.

2- you can place the number at the start or end of the array.

you are required to convert the second array into the first one using a minimum number of operations.

INPUT FORMAT

N

FIRST ARRAY SECOND ARRAY

OUTPUT FORMAT

An integer denoting the number of operations

Example: Turn Array2 into Array1

Array1 = [4,2,3,1,5,6] Array2 = [3,1,4,6,5,2]

Returns 3:

Operation 1: Move 2 to beginning. Array2 = [2,3,1,4,6,5]

Operation 2: Move 4 to beginning. Array2 = [4,2,3,1,6,5]

Operation 3: Move 6 to end: Array2 = [4,2,3,1,5,6]