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Hence, gain expression will become:  \[ A_0 = \frac{g_{m1}*g_{m6}}{(\lambda_n*0.5*I_5+\lambda_p*0.5*I_5)*(\lambda_n*2.5*I_5+\lambda_p*2.5*I_5)}\]  \[ A_0 = 76.85 dB\] Hence, the gain specification is satisfied.  The values of gm3 and gm4 can be calculated from gm6 value with the information of relative dimensions of M4 and M6.  Such that,  \[ \frac{\frac{W_4}{L_4}}{\frac{W_6}{L_6}} = \frac{1}{5}\]  Hence,  \[ g_{m3} = g_{m4} = \frac{g_{m6}}{5}\]