In the expression below:  $$1\textasciitilde\square\textasciitilde2\textasciitilde\square \textasciitilde3 \textasciitilde\square \textasciitilde4$$  each $$\square$$ is to be replaced by either $$+$$ or $$\times$$.  What is the largest value of all the expressions that can be obtained in this way? 
Overseas Competition->Knowledge Point->Combinatorics->Number Puzzles->Number Puzzles (sign of operations)->Obtaining Maximum/Minimum Values 