#include<iostream>
#include<math.h>
using namespace std;
struct point
{
    double x,y;
};
point p[10];
void vuvejdene (int n)
{
  for (int i=0;i<n;i++)
  {
      cout<<"vuvedi dvete kordinati";
      cin>>p[i].x>>p[i].y;
  }
}
double distance(point a,point b)
{
    double x=(a.x-b.x);
    double y=(a.y-b.y);
    double dist=sqrt(x*x+y*y);
    return dist;

}
double maxdistance(int n)
{
    double max=0;
    for (int i=0;i<n-1;i++)
    {
        for (int j=i;j<n;j++)
            {
                if (distance(p[i],p[j])>max) {max=distance(p[i],p[j]);}
            }
    }
    return max;
}
int main()
{
 int n;
 cout<<"vuvedi broi tochki";
 cin>>n;
 vuvejdane(n);
 cout<<"nai golemo "<<maxdistance(n);
 return 0;
}