#line 1 "/mnt/c/Users/leafc/dev/compro/lib/template.hpp"


#include <bits/stdc++.h>
#define REP(i, n) for (int i = 0; i < n; i++)
#define FOR(i, m, n) for (int i = m; i < n; i++)
#define ALL(v) (v).begin(), (v).end()
#define coutd(n) cout << fixed << setprecision(n)
#define ll long long int
#define vl vector<ll>
#define vi vector<int>
#define MM << " " <<

using namespace std;

template <class T> void say(bool val, T yes = "Yes", T no = "No") { cout << (val ? yes : no) << "\n"; }

template <class T> void chmin(T &a, T b) {
  if (a > b)
    a = b;
}

template <class T> void chmax(T &a, T b) {
  if (a < b)
    a = b;
}


#line 2 "tmp.cpp"

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

  int n;
  cin >> n;
  vi y(n);
  REP(i, n) { cin >> y[i]; }
  vector<vi> dp(n + 1, vi(10001, 0));

  FOR(i, 1, n + 1) {
    int cur = dp[i - 1][0];
    REP(j, 10001) {
      chmin(cur, dp[i - 1][j]);
      dp[i][j] = cur + abs(y[i - 1] - j);
    }
  }

  int ans = 1e9;
  REP(j, 10001) { chmin(ans, dp[n][j]); }
  cout << ans << endl;

  return 0;
}