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

using namespace std;

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

#define why(n,x) int n;while(cin >>n,n!=x)

#define iFOR(i,x,n)for(int i=x;i<n;i++)

#define unless(flg) if ( !(flg) )

#define read cin<<

#define echo cout<<

#define fin <<'\n'

#define __ <<" "<<

#define ___ <<" "

#define bash push_back

#define ALL(x) x.begin(),x.end()

#define SWAP(a,b) ((a != b) && (a += b,b = a - b,a -= b))

#define cinf(n,x) for(int UNCH=0;UNCH<(n);UNCH++) cin >> x[UNCH];

#define fcin(n,x) for(int UNCH=1;UNCH<=(n);UNCH++) cin>> x[UNCH];

#define memmin(x) memset((x),-1,sizeof((x)))

#define memzer(x) memset((x), 0,sizeof((x)))

#define meminf(x) memset((x),0x3f,sizeof((x)))



typedef long long ll;

typedef pair < int , int >  pii;

typedef vector < int > vit;

typedef map < string , int > mstit;

typedef vector < pii > vpi ;

typedef greater < pii > gpi;

typedef priority_queue < pii , vpi , gpi > dijk ;

static const signed int INF = 0x3f3f3f3f;

static const signed long long LINF = 0x3f3f3f3f3f3f3f3fLL;

static const signed int SMOD = 1000000007;

static const signed int NMOD = 1000000009;

static const signed int dx[]={1,0,-1,0,1,1,-1,-1};

static const signed int dy[]={0,-1,0,1,-1,1,-1,1};



bool inside(int x,int y,int w,int h){return (x>=0 && y>=0 && x<w && y<h);}

template<class T>T abs(T &x){return x<0 ? -x : x;}

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }

template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

int qp(int a,ll b,int mo){int ans=1;do{if(b&1)ans=1ll*ans*a%mo;a=1ll*a*a%mo;}while(b>>=1);return ans;}

int gcd(int a,int b){return b?gcd(b,a%b):a;}

int lcm(int a,int b){return a/gcd(a,b)*b;}

//#define int long long



int h[100005];

int mem[100005];

int dp(int n){

    if(mem[n]!= -1)

        return mem[n];

    if(n < 1)

        return INF;

    if(n==1)

        return 0;

    int a1 = dp(n-1) + abs(h[n]-h[n-1]);

    int a2 = dp(n-2) + abs(h[n]-h[n-2]);



    return mem[n] = min(a1,a2);

}



inline void solve(){



    int n;

    cin >> n;

    memset(mem,-1,sizeof(mem));

    

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

        cin >> h[i];

    }



    cout << dp(n) << endl;



}



struct xyz{ xyz(){ cin.tie(0), ios::sync_with_stdio(false); cout <<fixed<<setprecision(12);};}xyzzy;signed main(){solve();return 0;}




// Faster C++ solution for the same problem (measured speedup: 1.3930855804671236x):
#include <bits/stdc++.h>

using namespace std;

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

#define why(n,x) int n;while(cin >>n,n!=x)

#define iFOR(i,x,n)for(int i=x;i<n;i++)

#define fin <<'\n'

#define __ <<" "<<

#define ___ <<" "

#define bash push_back

#define ALL(x) x.begin(),x.end()

#define SWAP(a,b) ((a != b) && (a += b,b = a - b,a -= b))

//#define int long long

typedef long long ll;

typedef pair < int , int >  pii;

typedef vector < int > vit;

typedef map < string , int > mstit;

typedef vector < pii > vpi ;

typedef greater < pii > gpi;

typedef priority_queue < pii , vpi , gpi > dijk ;

static const signed int INF = 0x3f3f3f3f;

static const signed long long LINF = 0x3f3f3f3f3f3f3f3fLL;

static const signed int SMOD = 1000000007;

static const signed int NMOD = 1000000009;

static const signed int dx[]={1,0,-1,0,1,1,-1,-1};

static const signed int dy[]={0,-1,0,1,-1,1,-1,1};



bool inside(int x,int y,int w,int h){return (x>=0 && y>=0 && x<w && y<h);}

template<class T>T abs(T &x){return x<0 ? -x : x;}

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }

template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

int qp(int a,ll b,int mo){int ans=1;do{if(b&1)ans=1ll*ans*a%mo;a=1ll*a*a%mo;}while(b>>=1);return ans;}

int gcd(int a,int b){return b?gcd(b,a%b):a;}



int n;



vector<int> h,dp;



inline void solve(){



    cin >> n;

    h.resize(n);

    dp.resize(n+2);

    for(int i = 0; i < n; i++) {

        cin >> h[i];

    }



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

        dp[i] = dp[i-1] + abs(h[i] - h[i-1]);

        if(i>1)

            chmin(dp[i], dp[i-2]+abs(h[i]-h[i-2]));

        

    }



    cout << dp[n-1] << endl;

    

}

struct xyz{ xyz(){ cin.tie(0), ios::sync_with_stdio(false); cout <<fixed<<setprecision(12);};}xyzzy;signed main(){solve();return 0;}