GATE Electronics and Communications (EC) 2017 Shift 1 Solved Paper

The open loop transfer function $\mathit{G}\left(\mathit{s}\right)=\frac{\left(\mathit{s}+1\right)}{{\mathit{s}}^{\mathit{p}}\left(\mathit{s}+2\right)\left(\mathit{s}+3\right)}$
Where p is an integer, is conducted in unity feedback configuration as shown in the figure.

Given that the steady state error is zero for unit step input and is 6 for unit ramp input, the value of the parameter p is______.