The compound shown is one stereoisomer of 2-isopropyl-5-methylcyclohexan-1-ol drawn with wedges (C1 bears $\mathrm{OH}$, C2 bears isopropyl, C5 bears methyl). How many of its three stereocentres have the $(R)$ configuration? Give an integer.

C1: $\mathrm{OH}>\mathrm{C}{}_2$ (attached to C,C,H) $>\mathrm{C}{}_6$ (C,H,H) $>\mathrm{H}$; the drawn arrangement gives $(R)$. C2: $\mathrm{C}{}_1$ (O,C,H) $>$ isopropyl (C,C,H) $>\mathrm{C}{}_3$ (C,H,H) $>\mathrm{H}$; the drawing gives $(S)$. C5: $\mathrm{C}{}_6$ (leads to C1 bearing O) $>\mathrm{C}{}_4>\mathrm{CH}{}_3>\mathrm{H}$; the drawing gives $(R)$. The compound shown is $(1R,2S,5R)$, which is natural (-)-menthol, so 2 centres are $(R)$.