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