A gas mixture of $50 \text{ wt. \%}$ argon and $50 \text{ wt. \%}$ helium flowing through a horizontal tube of uniform diameter at a rate of $1 \text{ kg s}^{-1}$ is heated from $300 \text{ K}$ to $400 \text{ K}$ at $1 \text{ bar}$. Neglect shaft work, and changes in kinetic as well as potential energies between the inlet and the outlet. Assume the mixture exhibits ideal gas behavior. The specific enthalpies of the components are given in the following table: Component: Argon Specific enthalpy at 300 K: 348 kJ/kg Specific enthalpy at 400 K: 400 kJ/kg Component: Helium Specific enthalpy at 300 K: 1574 kJ/kg Specific enthalpy at 400 K: 2092 kJ/kg At steady state, the heat input required (in kW) is ___________ (rounded off to the nearest integer).