Let (Ω, F, P) represent a probability space where Ω = {1,2,3,...}, F is the sigma-algebra of all subsets of Ω, and P is a probability measure such that P({n}) = 1/2^n for n ∈ Ω. Use the axiom of countable additivity to calculate the probability of the entire sample space, i.e., P(Ω).