What happens when solid $CuCN$ is dissolved in aqueous solution of KCN?

$CuCN$  is in soluble on addition of $KCN$  complex is formed so number of ions increases depression in freezing point increases  

$\underset{\left(S\right)}{CuCN}+\underset{\left(aq\right)}{3KCN}\to K_3{\left[Cu{\left(CN\right)}_4\right]}_{\left(aq\right)}$

$Cu{\left(CN\right)}_S+\underset{6\text{\hspace{0.17em}}moles}{\underbrace{3K_{\left(aq\right)}^{+}+3C{N}_{\left(aq\right)}^{-}}}\to \underset{4moles}{\underbrace{3K_{\left(aq\right)}^{+}+{\left[Cu{\left(CN\right)}_4\right]}_{\left(aq\right)}^{3-}}}$

$\Delta T_f\alpha$ number of particles of solute