import std.stdio;
import std.algorithm;
import std.array;
import std.bigint;
import std.conv;
import std.math;
import std.range;
import std.string;
import std.typecons;

long diffSum(long[] arr, long p) {
  long ret;
  foreach(a; arr) ret += (p - a).abs;
  return ret;
}

void main() {
  int N = readln.chomp.to!int;
  auto Y = readln.chomp.split.map!(to!long).array;
  auto t = reduce!(min, max)(Y); // これすごい
  
  long lb = t[0], rb = t[1] + 1, mid;
  long ans = Y.diffSum(lb);

  while (rb - lb > 1) {
    mid = (lb + rb) / 2;
    long dsum = Y.diffSum(mid);

    if (ans < dsum) {
      rb = mid;
    }
    else {
      ans = dsum;
      lb = mid;
    }
  }

  ans = ans.min(Y.diffSum(lb).min(Y.diffSum(rb)));

  ans.writeln;
}