For a holiday party, Barbara is making a seven-layer torte, which consists of seven 9-inch diameter cake layers with a cream topping on each layer.

For a holiday party, Barbara is making a seven-layer torte, which consists of seven 9-inch diameter cake layers with a cream topping on each layer. She knows that one recipe of cream will cover 50 square inches of cake. How many batches of the topping must she make to complete her torte? (Use п = 3.14 as an approximate value)