Your company just paid a dividend of $$1\mathrm{.}50.$ The dividend growth rate is expected to be $20\%$ for $1$ year, $15\%$ the next year, then $10\%$ for the following year, and a constant $5\%$ thereafter. The stock's required return $(r_s)$ is $8\mathrm{.}5\%.$ What is the current stock price?