#include <bits/stdc++.h>
#ifdef _DEBUG
#include "debug.hpp"
#else
#define debug(...)
#endif
#define REP(i, m, n) for(int i = (int)(m); i < (int)(n); ++i)
#define rep(i, n) REP(i, 0, n)
using namespace std;
using ll = long long;
using ld = long double;
using pll = pair<ll, ll>;
template<class T, class U> inline bool chmax(T &a, const U &b) { if(a < b) { a = b; return true; } return false; }
template<class T, class U> inline bool chmin(T &a, const U &b) { if(a > b) { a = b; return true; } return false; }

int n, y[1000], dp[10100];

int main() {
  cin.tie(0); ios::sync_with_stdio(false);
  cin >> n;
  rep(i, n) cin >> y[i];
  rep(i, n) {
    rep(j, 10001) {
      dp[j] += abs(y[i]-j);
    }
    rep(j, 10000) chmin(dp[j+1], dp[j]);
  }
  int ans = dp[10000];
  cout << ans << '\n';
  return 0;
}