Consider the following two relations, $R(A, B)$ and $S(A, C)$:
$R$ |
$A$ | $B$ |
$10$ | $20$ |
$20$ | $30$ |
$30$ | $40$ |
$30$ | $50$ |
$50$ | $95$ |
$S$ |
$A$ | $C$ |
$10$ | $90$ |
$30$ | $45$ |
$40$ | $80$ |
The total number of tuples obtained by evaluating the following expression
$\sigma_{B<C}\left(R \bowtie_{R . A=S . A} S\right)$ is ___________.