Б>># Enter your code here. Read input from STDIN. Print output to STDOUT

Б>>import math

Б>>def read_input():
Б>>    n = float(input())
Б>>    x_arr = [float(x) for x in input().split()]
Б>>    y_arr = [float(x) for x in input().split()]
Б>>    return x_arr, y_arr

Б>>def mean_std(arr):
Б>>    n = len(arr)
Б>>    mean = sum(arr) / n
Б>>    d = sum([(x-mean)**2 for x in arr]) / n
Б>>    std = math.sqrt(d)
Б>>    return mean, std

Б>>def pearson(x_arr, y_arr):
Б>>    mean_x, std_x = mean_std(x_arr)
Б>>    mean_y, std_y = mean_std(y_arr)
Б>>    p_numerator = sum([(x-mean_x)*(y-mean_y) for x,y in zip(x_arr,y_arr)])
Б>>    p_denominator = len(x_arr) * std_x * std_y
Б>>    return p_numerator / p_denominator

Б>>def main():
Б>>    x_arr, y_arr = read_input()
Б>>    p = pearson(x_arr, y_arr)
Б>>    print(f'{p:.3g}')

Б>>main()
Б>>