If $\overline{\mathrm{a}},\overline{\mathrm{b}},\overline{\mathrm{c}}$ are unit vectors such that $\overline{\mathrm{a}} + \overline{\mathrm{b}} + \overline{\mathrm{c}} = \overline{0}$ , then $\overline{\mathrm{a}}.\overline{\mathrm{b}} + \overline{\mathrm{b}}.\overline{\mathrm{c}} + \overline{\mathrm{c}}.\overline{\mathrm{a}}=$

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