#include "bits/stdc++.h"

#define REP(i, n, N) for(ll i=(n); i<(N); i++)
#define RREP(i, n, N) for(ll i=(N-1); i>=(n); i--)
#define LREP(lst,itr) for(auto itr = lst.begin(); itr != lst.end(); ++itr)
#define CK(n, a, b) ((a)<=(n)&&(n)<(b))
#define ALL(v) (v).begin(),(v).end()
#define MCP(a, b) memcpy(b,a,sizeof(b))
#define P(s) cout<<(s)<<endl
#define P2(a, b) cout<<(a)<<" "<<(b)<<endl
#define V2(T) vector<vector<T>>
typedef long long ll;
using namespace std;
const ll MOD = 1e9 + 7;
const ll INF = 1e18;

struct point_dist{
    ll point1;
    ll point2;
    ll dist;
};

struct points{
    ll x;
    ll y;
};

bool cmp(const point_dist& A, const point_dist& B){
    return A.dist < B.dist;
}

ll pow(ll A){
    return A*A;
}

const int MAX_N = 100010;

struct UnionFind {
	int par[MAX_N];    // 親ノードの番号
	int deph[MAX_N];   // ノードの深さ

	UnionFind(int n) {
		fill(par, par + MAX_N, -1);
		for (int i = 0; i<n; i++) {
			par[i] = i;
			deph[i] = 0;
		}
	}

	int find(int x) {
		if (par[x] == x) {
			return x;
		} else {
			return par[x] = find(par[x]);
		}
	}

	void unite(int x, int y) {
		x = find(x);
		y = find(y);
		if (x == y) {
			/* 同じグループに属しているときの処理
			// istree = false;
			*/
			return;
		} 
		if (deph[x] < deph[y]) {
			par[x] = par[y];
		} else {
			par[y] = par[x];
			if (deph[x] == deph[y]) deph[x]++;
		}
	}

	bool same(int x, int y) {
		return find(x) == find(y);
	}
};

int main(){
    ll n,x,y;
    cin >> n;
    vector<points> ps(n+1);
    vector<point_dist> pd;
    REP(i,1,n+1){
        cin >> x >> y;
        ps[i].x=x;
        ps[i].y=y;
    }
    REP(i,1,n+1){
        REP(j,i+1,n+1){
            pd.push_back({i,j,pow(abs(ps[i].x-ps[j].x))+pow(abs(ps[i].y-ps[j].y))});
        }
    }
    
    /**
    for(auto item:pd){
        P2(item.point1,item.point2);
    }
    **/

    sort(pd.begin(),pd.end(),cmp);

    UnionFind uf(n);
    ll original;
    for(auto item : pd){
        uf.unite(item.point1,item.point2);
        if(uf.same(1,n)){
            original = item.dist;
            break;
        }
    }

    if(original%100==0){
        P(((ll)sqrt(original)/10)*10);
    }else{
        P(((ll)sqrt(original)/10)*10+10);
    }
     
}