#include <bits/stdc++.h>
using namespace std;
int main() {
int n;
cin>>n;
vector<int> arr(n+1, 0);
for(int i=1;i<=n;i++){
int element;
cin>>element;
arr[i]=element;
}
vector<int> dp(n+1,0);
dp[1]=0;
dp[2]=abs(arr[2]-arr[1]);
for(int i=3;i<=n;i++){
dp[i]=min(abs(arr[i]-arr[i-1]) + dp[i-1], abs(arr[i]-arr[i-2]) + dp[i-2]);
}
cout<<dp[n];
return 0;
}
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