Most likely you will not get the dividend because trading in Oslo will not resume until the ex-div date (typically, dividends go to the owners of record before market close on the day before the ex-div date).
In any case, you will get one of two things - the stock at the price before the dividend and the rights to the dividend, or you'll get no dividend, but get the stock at a similar price minus the dividend. You won't get the stock at the lower post-dividend price AND the dividend (no free lunch).
For example, if the stock is trading at 100 and announces a dividend of 5, one option is you pay 100 for the stock today, the value of the stock will drop to 95 on the ex-div date, and you'll eventually get a dividend of 5. Or, you'll pay 95 for the stock and not get a dividend. Either way you'll end up with 95 less cash than before and a stock worth 95 (per share, of course).
(I'm intentionally ignoring "normal" market fluctuations, just focusing on the effect of the dividend)