After i cleared the first round interview, recruiter asked me the expected salary and i told an amount. i had few more rounds of interviews left at this stage, i did some basic research while saying this. i cleard the rest of the interview rounds and i saw the compensation discussions in LC and found that for the same position and location i have only demanded only half the amount what is being offered by the company. is it okay to demand more at this stage and say i did not research earlier ?