Numberless Multitude

How many people were standing at Har Sinai? The answer is hidden from us. According to J, the nation was originally 600,000 people, but afterwards, yet before Har Sinai, died Am Rav, a large multitude, from Israel. According to E, the disaster was less, 3000 people died, but no number is given from which to subtract it. A mixed multitude was among them, according to E. And E tells us that the nation was still Rav, a multitude, in the eyes of Moav. However, if one would want a number, there is no answer. Israel was a numberless multitude, but, according to J, substantially fewer than 600,000 people.