Write a program which, given an integer n as input, will produce a mathematical expression whose solution is n The solution is restricted to using exactly four $4\text{'}$s and exactly three of the binary operations selected from the set $\{+,-,*,/\}$ The number $4$ is the ONLY number you can use. You are not allowed to concatenate fours to generate other numbers, such as $440$r $444$

for example n $=0$ a solution is $4*4-4*4=0.$ Given n $=7$ a solution is $4+4-4+4=7$ Division is considered truncating integer division, so that $1/4$ is $0($instead of $0\mathrm{.}25)$ Assume the usual precedence of operations so that $4+4*4=20,$ not $32.$ Not all integer inputs have solutions using four $4\text{'}$s with the aforementioned restrictions $($consider n $=11)$

Hint: Using your forehead and some forethought should make an answer forthcoming. When in doubt use the fourth.