#include <bits/stdc++.h>

#define M_PI       3.14159265358979323846   // pi

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<ll> VI;
typedef pair<ll, ll> P;
typedef tuple<ll, ll, ll> t3;
typedef tuple<ll, ll, ll, ll> t4;
typedef tuple<ll, ll, ll, ll, ll> t5;

#define rep(a,n) for(ll a = 0;a < n;a++)
#define repi(a,b,n) for(ll a = b;a < n;a++)

using namespace std;

static const ll INF = 1e15;

const ll mod = 1000000007;

template<typename T>
void chmin(T & ref, const T  value) {
	if (ref > value) ref = value;
}

int main() {
	int n;
	cin >> n;
	vector<ll> vs(n);
	rep(i, n) cin >> vs[i];
	vector<vector<ll>> dp(n + 1, vector<ll>(1e4 + 1, INF));
	dp[0][0] = 0;
	rep(i, n) {
		const ll v = vs[i];
		vector<ll> lows = dp[i];
		rep(j, 1e4) {
			lows[j + 1] = min(lows[j + 1], lows[j]);
		}
		rep(j, 1e4 + 1) {
			if (j <= v) {
				chmin(dp[i + 1][j], lows[j] + v- j );
			}
			else {
				chmin(dp[i + 1][j], dp[i][j] + j - v);
			}
		}
	}
	ll low = INF;
	rep(j, 1e4 + 1) {
		chmin(low, dp[n][j]);
	}
	cout << low << endl;
	return 0;
}