If the enthalpy of sublimation of Li is 155 kJ mol${}^{-1}$, enthalpy of dissociation of $F_2$ is 150 kJ mol${}^{-1}$, ionization enthalpy of Li is 520 kJ mol${}^{-1}$, electron gain enthalpy of F is $-313$ kJ mol${}^{-1}$, standard enthalpy of formation of LiF is $-594$ kJ mol${}^{-1}$. The magnitude of lattice enthalpy of LiF is ______ kJ mol${}^{-1}$ (nearest integer).