#include <bits/stdc++.h>
using namespace std;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}
using Int = long long;
const char newl = '\n';

//INSERT ABOVE HERE
signed main(){
  cin.tie(0);
  ios::sync_with_stdio(0);

  Int n;
  cin>>n;
  vector<Int> ys(n);
  for(Int i=0;i<n;i++) cin>>ys[i],ys[i]+=10000;

  const Int MAX = 4.1e4;
  const Int INF = 1e9;
  vector<Int> dp(MAX,0);

  for(Int y:ys){
    vector<Int> nx(MAX,INF);
    Int res=INF;
    for(Int i=0;i<MAX;i++){
      chmin(res,dp[i]);
      chmin(nx[i],res+abs(y-i));
    }
    swap(dp,nx);
  }
  cout<<*min_element(dp.begin(),dp.end())<<newl;
  return 0;
}