// Slower C++ solution:
#include<bits/stdc++.h>

using namespace std;



typedef long long ll;

typedef double dd;

typedef vector<int> vi;

typedef vector<ll> vl;

typedef pair<int,int> pii;



const int mx=1e5+11;

const double PI = acos(-1);

#define MOD 1000000007





#define nl '\n'

#define pb push_back

#define F first

#define S second

#define I insert

#define mp make_pair



#define sz(x) x.size()

#define sa(v) sort(v.begin(),v.end())

#define sd(v) sort(v.begin(),v.end(),greater<>())

#define rev(s) reverse(s.begin(),s.end())

#define tt int t; cin>>t; while(t--)

#define lo(i,a,b) for(ll i=a;i<b;i++)

#define be(a) (a).begin(),(a).end()

#define rbe(a) (a).rbegin(),(a).rend()



#define sqr(a) ((a) * (a))

#define gcd(a,b) __gcd(a,b)

#define lcm(a,b) (a*(b/gcd(a,b)))

#define mem(a,b) memset(a,b,sizeof(a))



#define yes cout<<"YES"<<nl;

#define no cout<<"NO"<<nl;



#define su ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

#define file freopen("input.txt","r",stdin);freopen("output.txt","w",stdout);

#define frac cout.unsetf(ios::floatfield); cout.precision(10); cout.setf(ios::fixed,ios::floatfield);



#define dbg(args...) do {cerr << #args << " : "; faltu(args); } while(0)

void faltu ()

{

    cerr << endl;

}

template < typename T, typename ... hello>void faltu( T arg, const hello &... rest)

{

    cerr << arg << ' ';

    faltu(rest...);

}



int dp[mx],n,a[mx];



int solve (int i)

{

    if ( i >= n )

        return 0;

    if ( dp[i]!= -1 )

        return dp[i];



    int ret1 = INT_MAX, ret2 = INT_MAX;



    if (i+1<=n )

        ret1 = abs(a[i]-a[i+1])+ solve (i+1);



    if(i+2<=n)

        ret2 = abs(a[i]-a[i+2])+solve (i+2);

    ///dbg(i);

    dp[i]= min ( ret1, ret2 );



    return dp[i];

}



int main()

{

    su;



    mem ( dp, -1 );



    cin>>n;



    for ( int i = 1; i <= n; i++ )

    {

        cin >>a[i];

    }



    cout << solve( 1 )<< nl;





    return 0;

}


// Faster C++ solution for the same problem (measured speedup: 1.4196352835034114x):
/* In the name of ALLAH */

#include<bits/stdc++.h>

#include<iostream>

#include<vector>

#include<string>



// MAXIMUM and MINIMUM elements

#define mx_ari(a)   *max_element(a , a+sizeof(a)/4)

#define mn_ari(a)   *min_element(a , a+sizeof(a)/4)

#define mx_arl(a)   *max_element(a , a+sizeof(a)/8)

#define mn_arl(a)   *min_element(a , a+sizeof(a)/8)

#define mx_vec(v)   *max_element(v.begin() , v.end())

#define mn_vec(v)   *min_element(v.begin() , v.end())

// COUNT the occurence of an element

#define cnt_ari(a,b)   count(a , a+sizeof(a)/4 , b)

#define cnt_arl(a,b)   count(a , a+sizeof(a)/8 , b)

#define cnt_vec(v,b)   count(v.begin() , v.end() , b)

// INPUTs

#define sci(a)        scanf("%d",&a)

#define scii(a,b)     scanf("%d %d",&a,&b)

#define sciii(a,b,c)  scanf("%d %d %d",&a,&b,&c)

#define scl(a)        scanf("%lld",&a)

#define scll(a,b)     scanf("%lld %lld",&a,&b)

#define sclll(a,b,c)  scanf("%lld %lld %lld",&a,&b,&c)

#define scf(a)        scanf("%f",&a)

#define scff(a,b)     scanf("%f %f",&a,&b)

#define scfff(a,b,c)  scanf("%f %f %f",&a,&b,&c)

#define scd(a)        scanf("%ld",&a)

#define scdd(a,b)     scanf("%lf %lf",&a,&b)

#define scddd(a,b,c)  scanf("%lf %lf %lf",&a,&b,&c)

// OUTPUTs

#define pri(a)        printf("%d ",a)

#define prii(a,b)     printf("%d %d ",a,b)

#define priii(a,b,c)  printf("%d %d %d ",a,b,c)

#define prl(a)        printf("%lld ",a)

#define prll(a,b)     printf("%lld %lld ",a,b)

#define prlll(a,b,c)  printf("%lld %lld %lld ",a,b,c)

#define prd(a)        printf("%.4lf ",a)

#define prdd(a,b)     printf("%.4lf %.4lf ",a,b)

#define prddd(a,b,c)  printf("%.4lf %.4lf %.4lf ",a,b,c)

#define prf(a)        printf("%.4f ",a)

#define prff(a,b)     printf("%.4f %.4f ",a,b)

#define prfff(a,b,c)  printf("%.4f %.4f %.4f ",a,b,c)

// LOOPs

#define foi(i,n)      for(int i=0;i<n;i++)

#define fol(i,n)      for(long long int i=0;i<n;i++)

#define fod(i,n)      for(double i=0;i<n;i++)

#define fof(i,n)      for(float i=0;i<n;i++)

// NEWLINEs

#define nwl           << "\n"

#define nl            printf("\n");

// PAIRs and PUSHbacks

#define mp            make_pair

#define pb            emplace_back

// IMPORTANTs

#define ll          long long

#define ull         unsigned long long int

#define mod         1000000007

#define lcm(a,b)     (a*b) / __gcd(a,b)



using namespace std;





int cost[100010];

int chi(int i , int n , int a[]){

   if(i < 0){

      return cost[0];

   }



   cost[i] = min(abs(a[i] - a[i+1])+cost[i+1] , abs(a[i] - a[i+2])+cost[i+2]);

   return chi(i-1 , n , a);

}



int main()

{

   int n;

   cin >> n;

   int a[n];

   foi(i,n){

      cin >> a[i];

   }



   cost[n-1] = 0;

   cost[n-2] = abs(a[n-1] - a[n-2]);



   cout << chi(n-3 , n , a);



   return 0;

}