import java.util.*;

public class Main {
    static final int MAX = 10000;
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] arr = new int[n];
		for (int i = 0; i < n; i++) {
		    arr[i] = sc.nextInt();
		}
		int[][] dp = new int[n][MAX + 1];
		for (int i = MAX; i >= 0; i--) {
		    dp[n - 1][i] = Math.abs(i - arr[n - 1]);
		}
		for (int i = n - 2; i >= 0; i--) {
		    int min = dp[i + 1][MAX];
		    for (int j = MAX; j >= 0; j--) {
		        min = Math.min(min, dp[i + 1][j]);
		        dp[i][j] = Math.abs(j - arr[i]) + min;
		    }
		}
		int min = Integer.MAX_VALUE;
		for (int i = 0; i <= MAX; i++) {
		    min = Math.min(min, dp[0][i]);
		}
		System.out.println(min);
	}
}