#include<iostream>

#include<cstdio>

#include<cstring>

#include<algorithm>

#include<cmath>

#include<cstdlib>

#include<ctime>

#define db double

using namespace std;

const int N=;

const db dc=0.99,eps=1e-;

int n,nx[N],ny[N];

db px,py,ans;

db dis(db x0,db y0,db x1,db y1)

{

  return sqrt((x0-x1)*(x0-x1)+(y0-y1)*(y0-y1));

}

db calc(db x,db y)

{

  db ret=;

  for(int i=;i<=n;i++)ret+=dis(nx[i],ny[i],x,y);

  return ret;

}

db gtrd(db T){return (rand()*-RAND_MAX)*T;}

void SA(db T)

{

  db x0=px,y0=py,pr=calc(x0,y0),x,y,cr;

  while(T>eps)

    {

      x=x0+gtrd(T); y=y0+gtrd(T); cr=calc(x,y);

      if(cr<pr||(exp((cr-pr)/T)*RAND_MAX<rand()))

    {

      ans=min(ans,cr);

      x0=x;y0=y;pr=cr;

    }

      T*=dc;

    }

}

int main()

{

  srand(time());

  scanf("%d",&n);

  for(int i=;i<=n;i++)scanf("%d%d",&nx[i],&ny[i]),px+=nx[i],py+=ny[i];

  px/=n; py/=n; ans=calc(px,py);

  SA();SA();SA();

  printf("%.0lf\n",ans);

  return ;

}