#include <iostream>
#include <random>
#include <bits/stdc++.h>
using namespace std;
using ull = __int128;
using ll = long long;
std::ostream &operator<<(std::ostream &dest, __int128_t value) {
  std::ostream::sentry s(dest);
  if (s) {
    __uint128_t tmp = value < 0 ? -value : value;
    char buffer[128];
    char *d = std::end(buffer);
    do {
      --d;
      *d = "0123456789"[tmp % 10];
      tmp /= 10;
    } while (tmp != 0);
    if (value < 0) {
      --d;
      *d = '-';
    }
    int len = std::end(buffer) - d;
    if (dest.rdbuf()->sputn(d, len) != len) {
      dest.setstate(std::ios_base::badbit);
    }
  }
  return dest;
}

__int128 p(string &s) {
  __int128 ret = 0;
  for (int i = 0; i < s.length(); i++)
    if ('0' <= s[i] && s[i] <= '9')
      ret = 10 * ret + s[i] - '0';
  return ret;
}
ll gcd(ll a,ll b)
{
   if (a%b == 0)
   {
       return(b);
   }
   else
   {
       return(gcd(b, a%b));
   }
}
ll z(ll a,ll b){
if(a<b){
    swap(a,b);
    return z(a,b);
}    
else{
    return a-b;
}
}
int main(){
    ll a;
    cin>>a;
    vector<ll> n(a);
    for(int i=0;i<a;i++){
        cin>>n.at(i);
    }
	sort(n.begin(), n.end());
	if(a%2==1){
	    ll k=n.at((a-1)/2);
	    ll ans=0;
	    for(int i=0;i<a;i++){
	        ans=ans+z(k,n.at(i));
	    }
	    cout<<ans<<endl;
	    }
	else{
	    ll k=(n.at(k/2)+n.at((k/2)-1));
	    ll ans=0;
	    for(int i=0;i<a;i++){
	        ans=ans+z(k,n.at(i));
	    }
	    cout<<ans<<endl;
	}
	
}