Physics hydrogen atom

Find the energy of a hydrogen atom whose electron is in the (a) n = 2 state and (b) n = 3 state.

energy of atom or energy of electron?..
energy of electron in nth shell in H atom =-13.6/n^2 eV per atom.

For n=2
E=-13.6/4 eV per atom.
For n=3
E=-13.6/9 eV per atom.