from itertools import permutations
def calc(N,A,B):
    win = 0
    al = list(permutations(range(N)))
    total = len(al)
    for v in al:
        for u in al:
            a = 0
            b = 0
            for i in v:
                for j in u:
                    if A[i] > B[j]:
                        a += 1
                    elif A[i] < B[j]:
                        b += 1
            if a > b:
                win += 1
    return win/2*total
def main():
    N = int(input())
    A = list(map(int,input().split(" ")))
    B = list(map(int,input().split(" ")))
    print(calc(N,A,B))

if __name__ == '__main__':
    main()