#include <iostream>
#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define cy cout << "YES"
#define cn cout << "NO"
#define nl "\n"
#define cin(v) for(int i=0;i<n,cin>>v[i];i++)
#define cout(v) for(int i=0;i<v.size(),cout<<v[i]<<" ";i++)
#define all(v) v.begin(),v.end()
#define sz(s) s.size()

void sherry()
{
    ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
#endif
}
vector<int> saved, v;
int n;
int rec(int i){
    if(i == n - 1)
        return 0;
    int& ret = saved[i];
    if(~ret)
        return ret;
    ret = 1e9;
    if(i + 1 < n)
        ret = min(ret, abs(v[i] - v[i + 1])) + rec(i + 1);
    if(i + 2 < n)
        ret = min(ret, abs(v[i] - v[i + 2])) + rec(i + 2);
    return ret;
}
void solve(){
    cin >> n;
    v.resize(n);
    saved.assign(n + 5, -1);
    cin(v);
    cout << rec(0);
}
int main()
{
    sherry();
    int t = 1;
    //cin >> t;
    while(t--){
        solve();
    }
    return 0;
}