$\mathrm{If} \mathrm{f} : \mathrm{R}\to \mathrm{R}$ is continuous such that

$$\begin{gathered} \mathrm{f}(\mathrm{x}+\mathrm{y})=\mathrm{f}\left(\mathrm{x}\right)+\mathrm{f}\left(\mathrm{y}\right), \mathrm{x}, \mathrm{y}\in \mathrm{R}, \\ \mathrm{f}\left(1\right)=\frac{1}{2}, \mathrm{then} \mathrm{f}\left(200\right) \end{gathered}$$

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