#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;
int n;
int arr[100005];
int dp[100005];
int frog(int i) {
    if(i >= n - 1) {
        return 0;
    }
    if(dp[i] != -1) {
        return dp[i];
    }
    int result = 2e9;
    if(i + 1 < n)
        result = min(result, frog(i + 1) + abs(arr[i + 1] - arr[i]));
    if(i + 2 < n)
        result = min(result, frog(i + 2) + abs(arr[i + 2] - arr[i]));
    
    return dp[i] = result;
}
int main()
{
    cin >> n;
    for(int i = 0; i < n; i++) {
        cin >> arr[i];
    }
    memset(dp, -1, sizeof dp);
    cout << frog(0) << endl;
    return 0;
}