Answer
$I_5 = 1$ Amp inward
Work Step by Step
We must use Kirchoff's junction law, $\Sigma I_{in} = \Sigma I_{out}$
The wires that have 6 and 2 amps are flowing outward, and the 3, 4, and unknown amp wires flow inward.
$\therefore$ $3+4+I_5=6+2$
Since $I_5$ is positive, $I_5$ flows inward
$I_5 = 1$ Amp
