If complex compound, Feπ−C5H5xπ−C3H5y(CO)z is following the Sidwick's rule of EAN then value of expression " x + y + z" is :(Where x,y and z are natural numbers)

Ligand (s)                                          One ligand donate 2e−π−C5H5                                           6e−π−C3H5                                           4e−CO                                                     2e− If Feπ−C5H5xπ−C3H5y(CO)2Complex compound following Sidewick's rule then26 -(2) +6 (1) + 4 (1) +2 (1) = 36x+y+z =1+1+1 =3