#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin >> n;
    int y[n];
    for(int i=0;i<n;i++){
        cin >> y[i];
    }

    vector<vector<int> >dp(n,vector<int>(n+1,1<<30));
    for(int i=0;i<=10000;i++){
        dp[0][i] = abs(y[0]-i);
    }
    for(int i=1;i<n;i++){
        int minn[10001];
        minn[0] = dp[i-1][0];
        for(int j=1;j<=10000;j++){
            minn[j] = min(minn[j-1],dp[i-1][j]);
        }
        for(int j=0;j<=10000;j++){
            dp[i][j] = minn[j] + abs(y[i]-j);
        }
    }
    int ans = 1<<30;
    for(int i=0;i<=10000;i++){
        ans = min(ans,dp[n-1][i]);
    }
    cout << ans << endl;
}