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

using ll = long long;
const ll INF = (ll)4e18;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int N;
    cin >> N;

    vector<ll> x(N), y(N);
    for (int i = 0; i < N; i++)
        cin >> x[i] >> y[i];

    vector<ll> dist(N, INF);
    vector<bool> used(N, false);

    dist[0] = 0;
    ll maxEdge = 0;

    for (int i = 0; i < N; i++) {
        int u = -1;

        for (int j = 0; j < N; j++) {
            if (!used[j] && (u == -1 || dist[j] < dist[u]))
                u = j;
        }

        used[u] = true;
        maxEdge = max(maxEdge, dist[u]);

        for (int v = 0; v < N; v++) {
            if (!used[v]) {
                ll dx = x[u] - x[v];
                ll dy = y[u] - y[v];
                ll d = dx * dx + dy * dy;
                dist[v] = min(dist[v], d);
            }
        }
    }

    double L = sqrt((double)maxEdge);

    long long ans = (long long)ceil(L / 10.0) * 10;
    cout << ans << "\n";
}