# Enter your code here. Read input from STDIN. Print output to STDOUT
import statistics as stat
from sys import stdin, stdout

def spearman(X, Y, n):
    def rank(arr):
        ref = sorted(arr)
        rank = []
        for ele in arr:
            rank.append(ref.index(ele)+1)
        return rank
    
    def correlation(X, Y, n):
        std_x = stat.pstdev(X)
        std_y = stat.pstdev(Y)
        m_x = stat.mean(X)
        m_y = stat.mean(Y)
        corr = 0
        for i in range(n):
            corr += (X[i]-m_x)*(Y[i]-m_y)/n
        p_coeff = corr/(std_x*std_y)
        return round(p_coeff, 3)
    
    rank_x = rank(X)
    rank_y = rank(Y)
    spearman_coeff = correlation(rank_x, rank_y, n)
    stdout.write(str(spearman_coeff))
                
    
n = int(stdin.readline().strip())
X = list(map(float, stdin.readline().strip().split()))
Y = list(map(float, stdin.readline().strip().split()))
spearman(X, Y, n)