Electrochemistry · Nernst equation pH dependence

Consider the following electrochemical cell :

Pt $\mid$ $\ce{O2}$(g) (1bar) $\mid$ HCl (aq) $\parallel$ $\ce{M^2+}$(aq, 1.0 M) $\mid$ M(s)

The pH above which, oxygen gas would start to evolve at anode is (nearest integer).

[Given : $E^{0}_{\mathrm{M^{2+}/M}} = 0.994$ V and $E^{0}_{\mathrm{O_2/H_2O}} = 1.23$ V (standard reduction potential) and $\dfrac{RT}{F}(2.303) = 0.059$ V at the given condition]