$${\mathtt{2}}{\mathtt{\,\small\textbf+\,}}{\mathtt{99}}{\mathtt{\,\times\,}}{\mathtt{34}}{\mathtt{\,-\,}}{\mathtt{123}}{\mathtt{\,\times\,}}{\mathtt{254}}{\mathtt{\,\small\textbf+\,}}{\mathtt{67}}{\mathtt{\,-\,}}{\frac{{\mathtt{1}}{\mathtt{\,\times\,}}{\mathtt{45}}}{{\mathtt{5}}}} = -{\mathtt{27\,816}}$$
.