Prorating a d Rights Subscription
736M shares outstanding. Let's say only 50% of shareholders subscribe for max 20 shares. 368M x 20 = 7.36B. Cap is set at 4.9B which is 66.5% of 7.36B.
So you would be able to buy 20 x 66.5% = 13 shares. If you only subscribed to 10 then you could only buy 6.6 shares.