/* -*- coding: utf-8 -*-
 *
 * 1077.cc:  No.1077 Noelちゃんと星々4 - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 1000;
const int MAX_Y = 10000;
const int INF = 1 << 30;

/* typedef */

/* global variables */

int ys[MAX_N], dp[MAX_N + 1][MAX_Y + 1];

/* subroutines */

inline void setmin(int &a, int b) { if (a > b) a = b; }
inline void setmax(int &a, int b) { if (a < b) a = b; }

/* main */

int main() {
  int n;
  scanf("%d", &n);

  int maxy = 0;
  for (int i = 0; i < n; i++) {
    scanf("%d", ys + i);
    setmax(maxy, ys[i]);
  }
  //printf("maxy=%d\n", maxy);

  int cur = 0, nxt = 1;
  for (int i = 0; i < n; i++) {
    fill(dp[nxt], dp[nxt] + maxy + 1, INF);
    int miny = INF;
    for (int j = 0; j <= maxy; j++) {
      setmin(miny, dp[cur][j]);
      setmin(dp[nxt][j], miny + abs(j - ys[i]));
    }
    swap(cur, nxt);
  }

  int mind = INF;
  for (int j = 0; j <= maxy; j++) setmin(mind, dp[cur][j]);

  printf("%d\n", mind);
  return 0;
}