#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
typedef long long ll;
using namespace std;

int main() {
    int N;
    cin >> N;
    vector<int> Y(N);
    rep(i, N) cin >> Y[i];

    int mx = 1e4;
    vector<vector<ll>> dp(N, vector<ll>(mx + 1, LONG_LONG_MAX));
    rep(i, mx + 1) dp[0][i] = abs(i - Y[0]);
    for (int i = 1; i < N; ++i) {
        ll mn = LONG_LONG_MAX;
        rep(j, mx + 1) {
            mn = min(mn, dp[i - 1][j]);
            dp[i][j] = min(dp[i][j], mn + (ll)abs(Y[i] - j));
        }
    }

    ll ans = LONG_LONG_MAX;
    rep(i, mx + 1) ans = min(ans, dp[N - 1][i]);
    cout << ans << endl;

    return 0;
}