#include<iostream>
#include<string>
#include<iomanip>
#include<cmath>
#include<vector>
#include<algorithm>
#include<utility>

using namespace std;

#define int long long
#define endl "\n"

constexpr long long INF = (long long)1e18;
constexpr long long MOD = 1'000'000'007; 

struct fast_io {
	fast_io(){
		std::cin.tie(nullptr);
		std::ios::sync_with_stdio(false);
	};
} fio;

signed main(){
	cout<<fixed<<setprecision(10);
	
	const int offset = 2000;
	const int MAX = 110000 + offset;
	int N;
	vector<int> Y;
	vector<vector<int>> dp;
	
	cin>>N;
	
	Y.resize(N);
	dp.resize(2, vector<int>(MAX, INF));
	
	
	for(int i = 0; i < N; i++){
		cin>>Y[i];
		
		Y[i] += offset;
	}
	
	for(int i = 0; i < MAX; i++){
		dp[0][i] = 0;
	}
	
	for(int i = 0; i < N; i++){
		for(int j = 0; j < MAX; j++){
			dp[(i+1)%2][j] = min(dp[(i+1)%2][j], dp[(i)%2][j] + abs(Y[i] - j));
		}
		
		for(int j = 0; j < MAX; j++){
			if(j) dp[(i+1)%2][j] = min(dp[(i+1)%2][j-1], dp[(i+1)%2][j]);
			dp[i%2][j] = INF;
		}
	}
	
	cout<<dp[N%2][MAX-1]<<endl;
	
	return 0;
}