#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    ll n;
    cin >> n;
    vector<pair<double,double>> a(n), b(n);
    long double X0 = 0, Y0 = 0, X1 = 0, Y1 = 0;
    long double sx0 = 0, sy0 = 0, sx1 = 0, sy1 = 0;
    for(auto &&[x, y] : a){
        cin >> x >> y;
        X0 += x, Y0 += y;
    }
    for(auto &&[x, y] : b){
        cin >> x >> y;
        X1 += x, Y1 += y;
    }
    long double s0 = 0, s1 = 0;
    for(auto &&[x, y] : a){
        long double dx = (ll)(n) * x - X0;
        long double dy = (ll)(n) * y - Y0;
        s0 = max(s0, dx * dx + dy * dy);
    }
    for(auto &&[x, y] : b){
        long double dx = (ll)(n) * x - X1;
        long double dy = (ll)(n) * y - Y1;
        s1 = max(s1, dx * dx + dy * dy);
    }
    cout << fixed << setprecision(15) << (double)sqrtl((long double)(s1) / s0) << '\n';
}