Force Method is considered for analysing the below structure. Primary structure, unknown reactions $($R$1$ and R$2)$ and the equatior to find the reactions are all shown in the below figure.

What is the value of moment at $C$ due to the unit load at $D$ according to the sign convention shown below?

Key in the result to ONE Decimal Place. For example, $1\mathrm{.}2$ and not $1$ or $1\mathrm{.}21$

Enter the numeric value without unit. For example, $1\mathrm{.}2$ and not $1\mathrm{.}2kN$

$L=2\mathrm{.}5m$

$P=2\mathrm{.}6kN$

$[$:$[{}_{12}],[{}_{22}]\}$