For positive real numbers $S$ and $K$, the function $H_K(S)$ is defined as: $H_K(S) = \max(S - K, 0)$. The $\max$ function is defined as: $$\max(a, b) = \begin{cases} a, & \text{when } a > b b, & \text{when } a \le b \end{cases}$$ The graph below shows the plot of a function $N(S)$ versus $S$. $N(S)$ can be expressed as ______.

For positive real numbers S and K, the function HK(S) is defined as: HK(S) = (S - K, 0). The function is defined as: (a, b) = cases a, & when a > b b, & when a b cases The graph below shows the plot of a function N(S) versus S. N(S) can be expressed as …

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