Question 5
If $n$ can take the value of any positive integer, how many distinct values can the expression $$\left\lfloor\frac n4\right\rfloor-\left\lfloor\frac n7\right\rfloor-\left\lfloor\frac n{14}\right\rfloor-\left\lfloor\frac n{28}\right\rfloor$$ take?