Условие:
$\begin{array}{r} \begin{array}{r} + \end{array} \begin{array}{r} 46 \\ 12 \end{array} \\ \begin{array}{r} \end{array} \end{array}$

\begin{array}{r} \begin{array}{r} + \end{array} \begin{array}{r} 46 \\ 12 \end{array} \\ \begin{array}{r} 58 \end{array} \end{array}

Условие: + 46 12