In the copper structure $($hard$-$drawn, oxygen$-$free cooper $[\backslash (99\mathrm{.}9\backslash \%\backslash$mathrm$\{$Cu$\}]\backslash ))$ shown below, a $6$ mm diameter pin is used at $\backslash ($ C $\backslash )$ and $10$ mm diameter pins are used at $\backslash ($ B $\backslash )$ and $\backslash ($ D $\backslash ).$ The ultimate shearing stress is $200$ MPa at all connections, and the ultimate normal stress is $390$ MPa in link $\backslash ($ B D $\backslash ).$ Knowing that a factor of safety of $3\mathrm{.}0$ is desired. Determine the largest load P that can be applied at $\backslash ($ A $\backslash ).$