// Slower C++ solution:
/*|In The Name Of Allah|*/



#include <bits/stdc++.h>



using namespace std;



const int N = 1e5+5;



int n;

int h[N];

int mem[N];



int go(int idx){

    if(idx >= n)

        return 0;

    if(mem[idx] != -1)

        return mem[idx];

    int best = 1e9;

    if(idx + 1 <= n)

        best = go(idx + 1) + abs(h[idx] - h[idx + 1]);

    if(idx + 2 <= n)

        best = min(best , go(idx + 2)  + abs(h[idx] - h[idx + 2]));

    return mem[idx] = best;

}



int main(){

    scanf("%d" , &n);

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

        scanf("%d" , &h[i]);

    }

    memset(mem , -1 , sizeof mem);

    printf("%d\n" , go(1));

}

//1 2 3


// Faster C++ solution for the same problem (measured speedup: 1.3850355248957589x):




/******************************************************/

/******************************************************/

/**                                                  **/

/**            BISMILLAHIR RAHMANIR RAHIM            **/

/**         REAZ AHAMMED CHOWDHURY - reaziii         **/

/**  Department of Computer Science and Engineering  **/

/*         INSTITUTE OF SCIENCE AND TECHNOLOGY       **/

/**                                                  **/

/******************************************************/

/******************************************************/







#include<bits/stdc++.h>

#define sc(x)        scanf("%lld",&x)

#define pcase(x)     printf("Case %d: ",x++)

#define pn           printf("\n")

#define fri(f)       for(int i=0;i<f;i++)

#define frj(f)       for(int j=0;j<f;j++)

#define reset(x,e)   memset(x,e,sizeof(x))

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

#define input        freopen("input.txt","r",stdin);

#define output       freopen("output.txt","w",stdout)

#define infi         INT_MAX

#define m_v          3000000

#define pii          pair<int,int>

#define pch          pair<char,char>

#define pll          pair<ll,ll>

#define mgraph       map<int,vector<int> >

#define mp           make_pair

#define pb           push_back

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

#define frx(x,y)     for(int x=0;x<y;x++)

#define ff           first

#define ss           second

using namespace std;

typedef long long int ll;

typedef unsigned long long int ull;

bool checkbitt(ll num, int pos);

ll setbitt(ll num, ll pos);

ll resetbitt(ll num, int pos);

void read(int *aa, int sz) {fri(sz) scanf("%d", (aa + i));}

void read(ll *aa, int sz) {fri(sz) scanf("%lld", (aa + i));}

void read(ll *aa, int s, int e) {for (int i = s; i < s + e; i++)scanf("%lld", (aa + i));}

void read(int *aa, int s, int e) {for (int i = s; i < s + e; i++)scanf("%d", (aa + i));}

const ll mod =       1e9 + 7;

const ll N =     1e6 + 10;



//.................___Start from here___.................//

//.................._____________________................//





int solve() {

	int n;

	cin >> n;

	int arr[n + 1];

	read(arr, 1, n);



	int dp[n + 100];

	clr(dp);



	for (int i = n - 1; i >= 1; i--) {

		int op1 = abs(arr[i] - arr[i + 1]) + dp[i + 1];

		int op2 = infi;



		if (i <= n - 2) {

			op2 = abs(arr[i] - arr[i + 2]) + dp[i + 2];

		}

		dp[i] = min(op1, op2);

	}



	cout << dp[1] << endl;





	return 0;

}

int main() {

// #ifndef ONLINE_JUDGE

// 	input;

// 	output;

// #endif

// #ifdef ONLINE_JUDGE

// 	ios_base::sync_with_stdio(false);

// 	cin.tie(0);

// #endif

	int cs = 1;

	int cn = 1;

	//cin>>cs;

	while (cs--) {

		solve();



	}

}





bool checkbitt(ll num, int pos) {return (num >> pos) & 1;}

ll setbitt(ll num, ll pos) {return (1 << pos) | num;}

ll resetbitt(ll num, int pos) {if (!checkbitt(num, pos)) return num; else return (1 << pos)^num;}