KartRider ★ experimental tasks Kart n vehicle license plate number are respectively 1,2, ..., n racing on the highway. Coffee is a KartRider love Well is the course of the game she shot two photos in the photo can clearly see each vehicle s license plate number. Shows two photographs from the first to the last one on the license plate number, please calculate your programming time period these two photos were taken Occurred at least several overtaking. ★ data input Enter the first line contains a positive integer n (1 <= n <= 50000), said the number of karting. The next two lines, each line Including the n integers, said the photo first to the last one from the license plate number (1 to n the full array), each of the two numbers Separated by a space between. ★ data output Output is only one number, that at least the number of overtaking occurred, the answer is in the range of int type.

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