#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
const int M = 12000;
signed main() { 
  ios::sync_with_stdio(false); cin.tie(0);
  int n;
  cin >> n;
  vector<int> a(n);
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  vector<int> dp(M, 1 << 30);
  dp[0] = 0;
  for (int i = 0; i < n; i++) {
    vector<int> nxt(M, 1 << 30);
    int mi = 1 << 30;
    for (int j = 0; j < M; j++) {
      mi = min(mi, dp[j]);
      nxt[j] = min(nxt[j], mi + abs(a[i] - j));
    }
    dp.swap(nxt);
  }
  cout << *min_element(dp.begin(), dp.end()) << endl;
  return 0;
}