#include<bits/stdc++.h>
using namespace std;
typedef long long int64;
#define SQR(a) ((int64)(a)*(int64)(a))
struct edge {
  int u, v;
  int64 cost;
  bool operator<(const edge& e) const {
    return(cost < e.cost);
  }
};

struct UnionFind {
  vector< int > data;
  UnionFind(int sz){
    data.assign(sz, -1);
  }
  int Find(int x){
    return(data[x] < 0 ? x : data[x] = Find(data[x]));
  }
  void Unite(int a, int b) {
    a = Find(a), b = Find(b);
    if(a == b) return;
    if(data[a] < data[b]) swap(a, b);
    data[b] += data[a];
    data[a] = b;
  }
  bool Same(int a, int b) {
    return(Find(a) == Find(b));
  }
};
  
int main()
{
  int N, X[1000], Y[1000];
  cin >> N;
  UnionFind uf(N);
  for(int i = 0; i < N; i++) {
    cin >> X[i] >> Y[i];
  }
  vector< edge > edges;
  for(int i = 0; i < N; i++) {
    for(int j = i + 1; j < N; j++) {
      edges.push_back((edge){i, j, SQR(X[i] - X[j]) + SQR(Y[i] - Y[j])});
    }
  }
  sort(edges.begin(), edges.end());

  int64 ret = 0;

  for(int i = 0; i < N; i++) {
    edge& e = edges[i];
    if(uf.Same(e.u, e.v)) continue;
    ret = e.cost;
    uf.Unite(e.u, e.v);
    if(uf.Same(0, N - 1)) break;
  }
  int64 low = 0, high = 1LL << 32;
  while(high - low > 0) {
    int64 mid = (low + high) >> 1LL;
    if(SQR(mid) >= ret) high = mid;
    else low = mid + 1;
  }
  cout << (low + 9) / 10 * 10 << endl;
}