$4-$One possible performance multiplication enhancement is to do a shift and add instead of an actual multiplication. Since $9*6,$ for example, can be written $(2*2**2+1,$ we can calculate $9**6$ by shifting $6$ to the left $3$ times and then adding $6$ to that result. Show the best way to calculate ${13}^{**}5$ using shifts and adds$/$subtracts$.$ Assume both inputs are $8-$bit unsigned integers.