A problem solving question dealing with logarithms :/

I seem to be stumped on this question for my homework:

"If a telephone network is designed to carry "C" telephone calls simultaneously, then the number of switches needed per call must be at least log2 C. If the network can carry 10,000 calls simultaneously, how many switches would be needed for one call and for 10,000 simultaneous calls?"

..That would be the problem, now I seem to have thought that log2 C = y would be the way to approach it, solving for "y", the number of switches but, that doesnt seem to work since there arent any whole numbers that could be used as an exponent for 2 to give me 10,000. I seem to be in my own little world with this one. Any help or insight would be great (Nod).