#include 
#include 
using namespace std;
int n;
int arr[100005];
int memo[100005];
int frog(int i) {
    if(i == n - 1) {
        return 0;
    }
    if(memo[i] != -1) {
        return memo[i];
    }
    int result = 2e9;
    if(i + 1 < n) {
        result = min(result, frog(i + 1) + abs(arr[i] - arr[i + 1]));
    }
    if(i + 2 < n) {
        result = min(result, frog(i + 2) + abs(arr[i] - arr[i + 2]));
    }
    return memo[i] = result;
}
int main() {
    cin >> n;
    for(int i = 0; i < n; i++) {
        cin >> arr[i];
        memo[i] = -1;
    }
    cout << frog(0) << endl;
    return 0;
}
// fib(7) = fib(6) + fib(5)
//