\text { A company produces } 2 \text { types of product. It uses } 3 \text { plants for the production. The } 1^{\text {st }} \text { product requires one } \text { hour in plant } 1 \text { and } 3 \text { hours in plant } 3 \text { for producing } item \text {. The } 2^{\text {nd }} \text { product requires } 2 \text { hours each in plant } 2 \text { and } 3 \text { for one production. Total available hours in plants } 1,2 \text { and } 3 \text { in a week are } 4,12 \text { and } 18 \text { respectively. } \text { Profit for each item of product } 1 \text { is } 3 \text { thousand, and for product } 2 \text { is } 5 \text { thousand. The possible maximum } \text { weekly profit for the company is- }