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Consider the operation $\ast$ defined by the following table: $$\begin{array}{ccccc}\ast & 1& 2& 3& 4\\ 1& 1& 2& 3& 4\\ 2& 2& 4& 1& 3\\ 3& 3& 1& 4& 2\\ 4& 4& 3& 2& 1\end{array}$$ For example, $3\ast 2=1$. Then $(2\ast 4)\ast (1\ast 3)=$