For the formation of the major, stable oxygen compound of Lithium, Sodium, and Potassium in excess o — s Block Elements Chemistry Question

Question

For the formation of the major, stable oxygen compound of Lithium, Sodium, and Potassium in excess oxygen, consider the stoichiometrically balanced equations with the smallest integer coefficients. If the reactions are: $a \text{Li} + b \text{O}_2 \rightarrow c \text{Product}$, $d \text{Na} + e \text{O}_2 \rightarrow f \text{Product}$, and $g \text{K} + h \text{O}_2 \rightarrow i \text{Product}$, what is the sum of the coefficients of the oxygen molecules ($b + e + h$)?