There is a parallelogram billboard with a height of 6.5 decimeters and a base of 8 decimeters. If you paint this billboard with paint, how many grams of paint should you prepare at least? (First complete the conditions on the horizontal line before answering.)
有一块平行四边形的广告牌，高是6.5分米，底是8分米．如果用油漆刷这块广告牌，多少则至少要准备多少克油漆？(先在横线上将条件补充完整，再解答．)
<result>50</result>