#include<bits/stdc++.h>

using namespace std;
using ll = long long int;
using lc = complex<double>;

int main(void) {
    constexpr ll MOD = 1e9 + 7;
    constexpr double PI = acos(-1);
    cout << fixed << setprecision(32);
    cin.tie(0); ios::sync_with_stdio(false);

    ll n;
    cin >> n;
    vector<vector<ll>> dp(n+1, vector<ll>(1e4+1));
    for(ll i=0; i<n; i++) {
        ll y;
        cin >> y;
        dp[i+1][0] = dp[i][0] + abs(y);
        for(ll j=1; j<=1e4; j++)
            dp[i+1][j] = min(dp[i+1][j-1], dp[i][j] + abs(y-j));
    }
    cout << *min_element(dp[n].begin(), dp[n].end()) << endl;
}