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