Among the following complexes, the total number of diamagnetic species is ____________.
\( [\text{Mn(NH}_{3})_{6}]^{3+} \), \( [\text{MnCl}_{6}]^{3-} \), \( [\text{FeF}_{6}]^{3-} \), \( [\text{CoF}_{6}]^{3-} \), \( [\text{Fe(NH}_{3})_{6}]^{3+} \), and \( [\text{Co(en)}_{3}]^{3+} \)
[Given, atomic number: \( \text{Mn} = 25 \), \( \text{Fe} = 26 \), \( \text{Co} = 27 \); en \( = \text{H}_{2}\text{NCH}_{2}\text{CH}_{2}\text{NH}_{2} \)]
