If $\left|\overline{\mathrm{a}}\right|=5,\left|\overline{\mathrm{b}}\right|=4,\left|\overline{\mathrm{c}}\right|=3$ and $\overline{\mathrm{a}}+\overline{\mathrm{b}}+\overline{\mathrm{c}}=0,$ then $\left|\overline{\mathrm{a}}. \overline{\mathrm{b}} + \overline{\mathrm{b}}. \overline{\mathrm{c}} + \overline{\mathrm{c}}. \overline{\mathrm{a}}\right| =$

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