Energy calculations in ionic compounds

What is the total change in energy when lithium metal reacts with fluor gas and forms solid lithium fluoride  

The arrows pointing upwards indicate that energy has to be supplied in order to make the reaction occur. The arrows pointing downwards indicate that energy is released when the reaction occurs. 1 mole of solid lithium fluoride is formed. 

The first step is to sublimate the lithium metal into lithium gas. The sublimation enthalpy is 161 kJ/mole. Thus 161 kJ are required. 

The second step is to get the lithium gas atom ionized. The ionization energy for lithium is 520 kJ/mole. Thus 520 kJ are required. 

The third step is to break the covalent F-F bonds in order to get single fluor atoms. It requires 154 kJ/mole to break the bonds and since a half mole of bonds are to be broken, 77 kJ are required. 

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