If z 1 , z 2 are complex numbers such that Re(z 1 ) = |z 1 – 1|, Re(z 2 ) = |z 2 – 1| and 1 2 arg( ) , 6 z z p – = then 1 2 Im( ) z z + is equal to :

If $z_{1}, z_{2}$ are complex numbers such that $\operatorname{Re}\left(z_{1}\right)=\left|z_{1}-1\right|$, $\operatorname{Re}\left(z_{2}\right)=\left|z_{2}-1\right|$ and $\arg \left(z_{1}-z_{2}\right)=\frac{\pi}{6}$, then $\operatorname{Im}\left(z_{1}+z_{2}\right)$ is equal to: