#include<iostream>

#include<cstdio>

#include<cstring>

#include<algorithm>

#include<cstdlib>

#include<ctime>

#include<cmath>

#define eps 1e-17

#define dt 0.99

using namespace std;

typedef double db;

int const xn=;

int n,xx[xn],yy[xn];

db ansx,ansy,ans;

int rd()

{

  int ret=,f=; char ch=getchar();

  while(ch<''||ch>''){if(ch=='')f=; ch=getchar();}

  while(ch>=''&&ch<='')ret=(ret<<)+(ret<<)+ch-'',ch=getchar();

  return f?ret:-ret;

}

db dist(db x,db y,db a,db b){return sqrt((x-a)*(x-a)+(y-b)*(y-b));}

db cal(db x,db y)

{

  db ret=;

  for(int i=;i<=n;i++)ret+=dist(x,y,xx[i],yy[i]);

  return ret;

}

void SA()

{

  db T=,x=ansx,y=ansy,lst=ans,tx,ty,tmp;

  while(T>eps)

    {

      tx=x+(rand()*-RAND_MAX)*T;

      ty=y+(rand()*-RAND_MAX)*T;

      tmp=cal(tx,ty); db delt=tmp-lst;

      if(delt<||exp(delt/T)*RAND_MAX<rand())x=tx,y=ty,lst=tmp;

      if(tmp<ans)ansx=tx,ansy=ty,ans=tmp;

      T*=dt;

    }

}

int main()

{

  n=rd(); int sx=,sy=;

  for(int i=;i<=n;i++)xx[i]=rd(),yy[i]=rd(),sx+=xx[i],sy+=yy[i];

  ansx=1.0*sx/n; ansy=1.0*sy/n; ans=cal(ansx,ansy);

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

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

  return ;

}