Consider the following reactions :

$NaCl{\rm{ }} + {\rm{ }}{K_2}C{r_2}{O_7} + \mathop {{H_2}S{O_4}}\limits_{(conc.)}$ \to $ (A) + side products

(A) + NaOH $\to$ (B) + Side products

$\left( B \right){\rm{ }} + \mathop {{H_2}S{O_4}}\limits_{(dilute)} + {\rm{ }}{H_2}{O_2}$ $\to$ (C) + Side products

The sum of the total number of atoms in one molecule each of (A) and (B) and (C) is