If $\overline{a}$ and $\overline{b}$ are two vectors such that $\overline{a}\mathit{=}\mathit{2}\overline{i}\mathit{+}\mathit{2}\overline{j}\mathit{+}p\overline{k}\mathit{,}\mathit{\left|}\overline{b}\mathit{\right|}\mathit{=}\mathit{7}\mathit{,}\overline{a}\mathit{.}\overline{b}\mathit{=}\mathit{4}$ and  $\left|\overrightarrow{a}\times \overrightarrow{b}\right|=5\sqrt{17}$ then p =    

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