Salary

$Richik$ has just completed his engineering and has got a job in one of the firms at $Sabrina$ which is ranked among the top seven islands in the world in terms of the pay scale. Since $Richik$ has to travel a lot to reach the firm, the owner assigns him a number $X$, and asks him to come to work only on the day which is a multiple of $X$. Richik joins the firm on 1-st day but starts working fro