{
	// Start with which Fibonacci number we want (Nth Fibonacci number)
	2 - // We push the first two already
	dup 0 <= { drop 1 } {
		1 1 // Starting Fibonacci numbers
		rot 0 swap // Setting up loop from zero to N
		{
			drop // Discard the loop counter
			swap 1 pick // Swap n-1 and n-2 and copy n-1
			+ // Add n-2 and the copy of n-1
			// n and n-1 left on stack
		} for
		swap drop // Drop n-1 from the stack
	} if
} lambda ::fib const

8 fib