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

#define rep(i, l, r) for (int i = (int)(l); i<(int)(r); i++)
#define ll long long

long double getdist(vector<pair<long double, long double>> G) {
    int N = (int)G.size();
    pair<long double, long double> g;
    rep(i, 0, N) {
        g.first += G[i].first;
        g.second += G[i].second;
    }
    g.first /= N; g.second /= N;
    long double ret = 0;
    rep(i, 0, N) {
        ret = max(ret, hypot(g.first-G[i].first, g.second-G[i].second));
    }
    return ret;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N; cin >> N;
    vector<pair<long double, long double>> A(N), B(N);
    rep(i, 0, N) cin >> A[i].first >> A[i].second;
    rep(i, 0, N) cin >> B[i].first >> B[i].second;
    long double resa = getdist(A), resb = getdist(B);
    cout << fixed << setprecision(15) << resb/resa << endl;
}