#include 

using namespace std;
int n;
int niza[100005];
int frog[100005];

int rec(int frog_at) {
    if(frog_at == n - 1) {
        return 0;
    }
    if(frog[frog_at] != -1) {
        return frog[frog_at];
    }
    int result = 2e9;
    if(frog_at + 1 < n) {
        
        result = min(result, rec(frog_at + 1) + abs(niza[frog_at] - niza[frog_at + 1]));
    }
    if(frog_at + 2 < n) {
        result = min(result, rec(frog_at + 2) + abs(niza[frog_at] - niza[frog_at +
                                                                         2]));
    }
    return frog[frog_at] = result;
}
int main()
{
    cin >> n;
    for(int i = 0; i < n; i++) {
        cin >> niza[i];
    }
    for(int i = 0; i <= n; i++) {
        frog[i] = -1;
    }
    cout<< rec(0) << endl;
    return 0;
}
/*
 rec(0) = MIN(rec(1) + 20 || rec(2) + 30) = MIN(30, 50) = 30
 rec(1) = MIN(rec(2) + 10 || rec(3) + 10) = Min(30, 10) = 10
 rec(2) = MIN(rec(3) + 20) = 20
 rec(3)  = 0
 **/