Methyl 4-(4-hydroxyphenyl)-4-oxobutanoate, $p\text{-}\mathrm{HO}-\mathrm{C}{}_6\mathrm{H}{}_4-\mathrm{CO}-\mathrm{CH}{}_2\mathrm{CH}{}_2-\mathrm{COOCH}{}_3$, is treated with a large excess of $\mathrm{CH}{}_3\mathrm{MgBr}$ in dry ether. Counting convention: each acidic O-H (alcohol, phenol or carboxylic acid) consumes 1 mole of $\mathrm{CH}{}_3\mathrm{MgBr}$; each aldehyde or ketone C=O consumes 1 mole; each ester consumes 2 moles (the ketone formed after loss of alkoxide is attacked as well); deprotonation of alpha C-H is ignored. How many moles of $\mathrm{CH}{}_3\mathrm{MgBr}$ are consumed per mole of the substrate? (Give the answer as an integer.)

Numerical answer type, tolerance 0.5.