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

int N;
int Y[1000];
int I[1000];
int rI[1000];
int dp[1000][1000];

bool cmpY(int l, int r) { return Y[l] < Y[r]; }
const int INF = 1000000000;

int main() {
	cin >> N;
	rep(i, N) cin >> Y[i];
	rep(i, N) I[i] = i;
	sort(I, I + N, cmpY);
	rep(i, N) rI[I[i]] = i;
	
	rep(i, N) rep(j, N) dp[i][j] = INF;
	rep(j, N) dp[0][j] = abs(Y[0] - Y[I[j]]);

	for (int i = 1; i < N; i++) {
		rep(j, N - 1) dp[i - 1][j + 1] = min(dp[i - 1][j + 1], dp[i - 1][j]);
		rep(j, N) dp[i][j] = dp[i - 1][j] + abs(Y[i] - Y[I[j]]);
	}

	int ans = INF; rep(i, N) ans = min(ans, dp[N - 1][i]);
	cout << ans << endl;

	return 0;
}