#include <bits/stdc++.h>
using namespace std;

#define int long long
#define rep(i,l,r) for(int i=(int)(l);i<(int)(r);i++)
#define all(x) (x).begin(),(x).end()
#define pb push_back
template<class T>bool chmax(T &a,T b){if(a<b){a=b;return 1;}return 0;}
template<class T>bool chmin(T &a,T b){if(a>b){a=b;return 1;}return 0;}

typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;

const int inf = 1LL<<60;
const int mod = 1e9 + 7;
const double eps = 1e-9;

/*{
}*/

int n, a[200000];

int f(int x)
{
  int res = 0;
  rep(i, 0, n) res += abs(a[i]-x);
  return res;
}

signed main()
{
  cin >> n;
  rep(i, 0, n) cin >> a[i];

  int l = -inf, r = inf;
  rep(i, 0, 10000){
    int x1 = (l+l+r)/3;
    int x2 = (l+r+r)/3;
    if(f(x1) < f(x2)) r = x2;
    else l = x1;
  }

  cout << f((l+r)/2) << endl;

  return 0;
}