A first-order irreversible liquid phase reaction A → B (k = 0.1 min^-1) is carried out under isothermal, steady state conditions in the following reactor arrangement comprising an ideal CSTR (Continuous-Stirred Tank Reactor) and two ideal PFRs (Plug Flow Reactors). From the information in the figure, the volume of the CSTR (in Liters) is ______ (rounded off to the nearest integer).