#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
#define rep(i,s,e) for(int (i) = (s);(i) <= (e);(i)++)

i64 N;
vector<i64> X;

i64 f(i64 k){
  i64 ans = 0;
  for(i64 x : X){
    ans += abs(x - k);
  }
  return ans;
}

int main(){
  cin >> N;
  X.resize(N);
  rep(i,0,N - 1) cin >> X[i];

  i64 x0 = -1e9;
  i64 x3 = 1e9;
  while(x3 - x0 > 10){
    i64 x1 = (x0 * 2 + x3) / 3;
    i64 x2 = (x0 + x3 * 2) / 3;
    if(f(x1) < f(x2)){
      x3 = x2;
    }
    else{
      x0 = x1;
    }
  }
  i64 MIN = f(x0);
  rep(i,x0,x3){
    MIN = min(MIN,f(i));
  }
  cout << MIN << endl;
}