SP3372 ROUNDT - Round Table

We have a round table with 2\*N seats (1

On the first line there will one integer - N. Two more lines of input follow each with N integers in the range \[1, 2N\] - the guests waiting in front of door 1 and door 2 respectively. The first people in the list is the first to enter the room.

Single integer the total min number of stand-ups that will happen if we choose the best sequence of letting guest in.