#include <bits/stdc++.h>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(true);
    int n;
    cin>>n;
    int x[n];
    int dp[n];
    memset(dp,0,sizeof dp);
    for(int i=0;i<n;i++)cin>>x[i];
    dp[0]=0;
    dp[1]=abs(x[0]-x[1]);
    for(int i=2;i<n;i++)
    {
        dp[i]=min(dp[i-1]+abs(x[i-1]-x[i]), dp[i-2]+abs(x[i-2]-x[i]));
    }
    cout<<dp[n-1];
    return 0;
}