Section 3.4 from The Tao of Programming, by Geoffrey James

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A manager went to the master programmer and showed him the requirements document for a new application.
The manager asked the master: "How long will it take to design this system if I assign five programmers
to it?"

"It will take one year," said the master promptly.

"But we need this system immediately or even sooner!  How long will it take if I assign ten programmers
to it?"

The master programmer frowned.  "In that case, it will take two years."

"And what if I assign a hundred programmers to it?"

The master programmer shrugged.  "Then the design will never be completed," he said.