Two ideal cross-current stages operate to extract P from a feed containing P and Q. as shown below. The mass flow rates of P and Q fed to Stage 1 are 1,000 kg h^-1 and 10,000 kg h^-1 respectively. Pure solvent (S) is injected at mass flow rates of 5,000 kg h^-1 and 15,000 kg h^-1 to Stages 1 and 2, respectively. The components Q and S are immiscible. The equilibrium relation is given by Y*=1.5X, where X is the mass of P per unit mass of Q in the raffinate, and Y* the mass of P per unit mass of S in the extract, which is in equilibrium with the raffinate. The mass flow rate of P (in kg h^-1) in the raffinate from Stage 2 is _______ (round off to nearest integer).