#include <bits/stdc++.h>
using namespace std;
using ll = long long int;
#define rep(i, a, b) for (ll i = (a); i < (b); i++)
#define cbuf(buf, init) memset(buf, init, sizeof(buf))
#define sq(x) (x) * (x)

ll N, X[2000], Y[2000];

bool used[2000];

bool dfs(ll now, ll l)
{
    if (now == N - 1) return true;
    used[now] = true;
    rep(i, 0, N)
    {
        if (used[i] || sq(X[now] - X[i]) + sq(Y[now] - Y[i]) > sq(l)) continue;
        if (dfs(i, l)) {
            return true;
        }
    }
    return false;
}

bool C(ll l)
{
    cbuf(used, false);
    return dfs(0, l);
}

int main()
{
    //
    cin >> N;
    rep(i, 0, N) { cin >> X[i] >> Y[i]; }

    ll lb = 0, ub = 2E9;
    while (ub - lb > 1) {
        ll mid = (lb + ub) / 2;
        mid = mid / 10 * 10;
        if (mid == lb) break;

        if (C(mid))
            ub = mid;
        else
            lb = mid;
    }
    cout << ub << endl;
}