Sindre,
Gaining weight is a simple function of getting enough calories.
SmellyOrc is right, those are good foods, but if you don't get enough of them you'll still stay at your current weight.
Without knowing your bodyweight/height/age/etc. I can't give you an exact number, but my guess would be that you're going to need around 3,000 calories every day if you want to gain weight at about a pound a week.
Good luck.
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