#include<bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define IO ios::sync_with_stdio(false), cin.tie(0)
#define endl '\n'
#define main() int main()
#define ff1(i,n) for(int i=1;i<=n;++i)
#define ff0(i,n) for(int i=0;i<n;++i)
#define pi acos(-1.0)
#define ms(a, x) memset(a, x, sizeof(a))
#define lowbit(x) ((x)&(-(x)))
#define pb push_back
#define binarycount __builtin_popcount(x)
#define tr t[root]
#define lson t[root << 1]
#define rson t[root << 1 | 1]
#define fir first
#define sec second
#define debug(x) cout<<x<<'\n'
#define sa(a) scanf("%d", &a)
#define sab(a, b) scanf("%d%d", &a, &b)
#define pa(a) printf("%d",a)
#define pab(a,b) printf("%d%d",a,b)
#define pii pair<string,int>
using namespace std;

#define maxn 40010
const int inf = 0x3f3f3f3f;
const int mod = 9973;
const double eps = 1e-8;
ll gcd(ll a, ll b) {return b==0?a:gcd(b, a%b);}
ll lcm(ll a, ll b) {return a/gcd(a, b)*b;}
int max(int x,int y){if(x>y) return x;return y;}
ll powmod(ll a,ll b){
    ull ans = 1, pow = a%mod;
    while(b) { if(b&1) ans = (ans*pow)%mod; pow = (pow*pow)%mod; b >>= 1; }
    return ans%mod;
}
main(){
	IO;
    int n;
	cin>>n;
	vector<int> a(n+1);
	ff1(i,n) cin>>a[i];
	int dp[n+1]={0};
	dp[1]=0;dp[2]=abs(a[2]-a[1]);
	for(int i=2;i<=n;i++){
		dp[i]=min(dp[i-1]+abs(a[i]-a[i-1]),dp[i-2]+abs(a[i]-a[i-2]));
	}
	cout<<dp[n]<<endl;
}