import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] y = new int[n];
		for (int i = 0; i < n; i++) {
			y[i] = sc.nextInt();
		}
		sc.close();

		int[][] dp = new int[n + 1][10001];
		for (int i = 1; i <= n; i++) {
			for (int j = 0; j <= 10000; j++) {
				dp[i][j] = dp[i - 1][j] + Math.abs(j - y[i - 1]);
				if (j > 0) {
					dp[i][j] = Math.min(dp[i][j], dp[i][j - 1]);
				}
			}
		}
		System.out.println(dp[n][10000]);
	}
}