Let \( A = \{2,3,5,7,9\} \). Let \( R \) be the relation on \( A \) defined by \( xRy \) if and only if \( 2x \le 3y \). Let \( l \) be the number of elements in \( R \), and \( m \) be the minimum number of elements required to be added in \( R \) to make it a symmetric relation. Then \( l + m \) is equal to:
