#include <cstdio>
#include <vector>
#include <set>
#include <iostream>
#include <iomanip>
#include <algorithm>
using namespace std;

float mean(vector<float> data){
    auto length = data.size();
    float res{0};
    for(int i = 0; i<length; i++){
        res+=data[i];
    }
    return res / length;
}

float covariance(vector<float>x,vector<float>y){
    int n = x.size();
    float mx{mean(x)}, my{mean(y)};
    float res{0};
    for(int i=0;i<n;i++){
        res+=(x[i]-mx)*(y[i]-my);
    }
    return res / n;
}

float sdev(vector<float>d){
    int n = d.size();
    float md{mean(d)};
    float res{0};
    for(int i=0;i<n;i++){
        res+=pow((d[i]-md),2);
    }
    return sqrt(res/n);
}

float pearson(vector<float>x, vector<float>y){
    return covariance(x, y) / (sdev(x)*sdev(y));
}

int set_index(set<float> s, float val)
{
    int i = 1;
 
    for (auto u : s) {
        if (u == val){
           return i; 
        }   
        i++;
    }
    return -1;
}

vector<float>rank_vector(vector<float>d){
    set<float>s;
    for(auto el : d){
        s.insert(el);
    }
    int n = d.size();
    vector<float>res(n);
    for(int i = 0; i<n; i++){
        res[i]=(float)set_index(s, d[i]);
    }
    return res;
}


int main() {
    int n{};
    cin >> n;
    vector<float> x(n), y(n);
    for(int i =0; i < n; i++){
        cin >> x[i];
    }
    for(int i =0; i < n; i++){
        cin >> y[i];
    }
    cout << fixed << setprecision(3)
         << pearson(rank_vector(x), rank_vector(y)) << endl;  
    return 0;
}