Let $\overline{\mathrm{u}}=\overline{\mathrm{i}}+\overline{\mathrm{j}},\overline{\mathrm{v}}=\overline{\mathrm{i}}-\overline{\mathrm{j}},\overline{\mathrm{w}}=\overline{\mathrm{i}}+2\overline{\mathrm{j}}+3\overline{\mathrm{k}}.$ If $\overline{\mathrm{n}}$ is a unit vector such that $\overline{\mathrm{u}},\overline{\mathrm{n}}=0$ and $\overline{\mathrm{v}},\overline{\mathrm{n}}=0,$ then $\overline{\mathrm{w}}.\overline{\mathrm{n}}=$

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