加算

$ \textrm{R}_1+\textrm{R}_2

https://gyazo.com/a8458d53dd88e5fccae521a6d1f875c1

(厳密には以下の式になります)

$ \textrm{Y}=\textup{min}(\textrm{Y}_1+\textrm{Y}_2, 2)

$ \textrm{Cb}=\begin{cases}{0\quad\small{(3\lt\textrm{Y}_1+\textrm{Y}_2)}}\\{(\textrm{Cb}_1+\textrm{Cb}_2)(3-(\textrm{Y}_1+\textrm{Y}_2))\quad\small{(2\lt\textrm{Y}_1+\textrm{Y}_2\le3)}}\\{\textrm{Cb}_1+\textrm{Cb}_2\quad\small{(\textrm{Y}_1+\textrm{Y}_2\le2)}}\end{cases}

$ \textrm{Cr}=\begin{cases}{0\quad\small{(3\lt\textrm{Y}_1+\textrm{Y}_2)}}\\{(\textrm{Cr}_1+\textrm{Cr}_2)(3-(\textrm{Y}_1+\textrm{Y}_2))\quad\small{(2\lt\textrm{Y}_1+\textrm{Y}_2\le3)}}\\{\textrm{Cr}_1+\textrm{Cr}_2\quad\small{(\textrm{Y}_1+\textrm{Y}_2\le2)}}\end{cases}