Why the dimension of V1 = ℤ₂Space(0=>3,1=>2) is 5?

I am not sure if this question would belong to mathematics or more suitable for mathematics stackexchange. It comes from

julia> V1 = ℤ₂Space(0=>3,1=>2)
Rep[ℤ₂](0=>3, 1=>2)

julia> dim(V1)

I think Z2 is cyclic group, Cyclic group:Z2 - Groupprops, but why the dimension is 5? In some representation?