ll n,x[1000],y[1000],k,m,r;
pair<ll,pair<ll,ll>> a[600000];
unionFind u;
{
	rd(n,(x,y)(n));
	rep(i,n)rep(j,i)a[m++]={(x[i]-x[j])**2+(y[i]-y[j])**2,{j,i}};
	sort(a,a+m);
	u.walloc(n);
	u.init();
	for(;u.connect(a[k].second.first,a[k].second.second),u.get(0)!=u.get(n-1);)++k;
	r=2**31-1;
	rep(i,31)if((r-2**(30-i))**2>=a[k].first)r-=2**(30-i);
	wt(r/+10*10);
}