#include <bits/stdc++.h>

using namespace std;

#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()

template<typename A, typename B> inline bool chmax(A &a, B b) { if (a<b) { a=b; return 1; } return 0; }
template<typename A, typename B> inline bool chmin(A &a, B b) { if (a>b) { a=b; return 1; } return 0; }

typedef unsigned long long ull;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<pii, pii> P;

const ll INF = 1ll<<29;
const ll MOD = 1000000007;
const double EPS  = 1e-10;

int n;
ll x[1000], y[1000];
ll d[1000];

int main() {
	cin >> n;
	REP(i, n) scanf("%lld %lld", x + i, y + i);
	
	fill(d, d + n, 1ll<<62);
	
	priority_queue<pll, vector<pll>, greater<pll> > pq;
	pq.push(pll(0, 0));
	
	while (!pq.empty()) {
		ll now = pq.top().first;
		int cur = pq.top().second;
		
		pq.pop();
		
		if (!chmin(d[cur], now)) continue;
		
		REP(i, n) if (i != cur && d[i] > now) {
			ll d = (x[i] - x[cur]) * (x[i] - x[cur]) + (y[i] - y[cur]) * (y[i] - y[cur]);
			ll sd = sqrt(d);
			
			if (d > sd * sd) sd++;
			
			pq.push(pll(max(sd, now), i));
		}
	}
	
	printf("%lld\n", (d[n - 1] + 9) / 10 * 10);
	
	return 0;
}