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Using Master Thoerem, we will be able to write the recursive cost of this function as:  \[T(n) = a + (n/b) + O(n^a)\]  The branching factor $a$ is 1 because we are only left with one subproblem at each iteration. Also doing $\frac{y}{2}$ takes constant time because $y$ is in the order of $2^n$, so dividing by 2 is just a simple bitshift. The subproblem is $n/2$ because you only have to deal with a number with half the bitsize. THe cost of combining the subproblems back to the larger problem is the cost of squaring a number and then take mod on a number order $2^0$.     Squaring a number is like multiplying two $n$ bit numbers and using Gauss' observation, it takes $O(n^{1.59})$ time. Taking mod on the order of $2^o$ is simple because you do a shift that takes constant time and the answer is the bits you were shifting. So the cost of recombining is $O(n^{1.59}$. SO using Master Theorem:     \[T(n) = 1*T(\frac{n}{2} + O(n^{1.59})\]  \end{itemize}