#include <bits/stdc++.h>
#define rep(i,n) for(int i=(0);i<(n);i++)

using namespace std;

typedef long long ll;
typedef unsigned long long ull;

template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);

	int n;
	cin >> n;

	vector<ll> y(n);
	rep(i, n) cin >> y[i];

	ll from = -1e10;
	ll to = 1e10;

	auto calc = [&y](ll x){
		ll ret = 0ll;
		for(ll z : y) ret += abs(z - x);
		return ret;
	};

	while(to - from > 1){
		ll mid = (from + to) / 2;
		(calc(mid) - calc(mid-1) > 0 ? to : from) = mid;
	}

	cout << calc(from) << endl;
}