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In figure, the $n$-channel $\textsf{MOSFETs}$ are identical and their current voltage characteristics are given by the following expressions:

For $V_{D S}, I_D=\left[\left(V_{G S}-1\right) V_{D S}-\frac{V^2 D S}{2}\right] m A$

For $V_{D S} \geq\left(V_{G S}-1\right),\left(V_{G S}-1\right)=\left(V_{G S}-1\right)^2 m A$

Where $V_{G S}$ and $V_{D S}$ are the gate source and drain source voltages respectively and $I_0$ is the drain current.

The current $I_{D C}$ flowing through the transistor ' $\mathrm{M}$ ' is equal to__________.