2 molal solution of a weak acid HA has a freezing point of 3.885$^\circ$C. The degree of dissociation of this acid is ___________ $\times$ 10^$-$3. (Round off to the Nearest Integer).
[Given : Molal depression constant of water = 1.85 K kg mol^$-$1 Freezing point of pure water = 0$^\circ$ C]