Use the Born-Haber cycle to calculate the lattice energy of KF. (AHsub for potassium is 89.0 kJ/mol, IE1 for potassium is 419 kJ/mol, EA1 for fluorine is -328 kJ/mol, the bond energy of F2 is 159 kJ/mol, AHof for KF is -567.3 kJ/mol .) Express your answer as an integer.