#include 
#include 
using namespace std;

int main() {
    int n;
    cin >> n;
    vector v(n);
    for(int i = 0; i < n; i++) {
        cin >> v[i];
    }
    vector dp(n, 2e9);
    dp[0] = 0;
    
    for(int i = 0; i < n; i++) {
        if(i + 1 < n) {
            dp[i + 1] = min(dp[i + 1], dp[i] + abs(v[i] - v[i + 1]));
        }
        if(i + 2 < n) {
            dp[i + 2] = min(dp[i + 2], dp[i] + abs(v[i] - v[i + 2]));
        }
    }
    cout << dp[n - 1] << endl;
    return 0;
}