The Internet says that the total cost for a degree from Johns Hopkins medical student per year is $64,665. In addition, various indirect costs like books, housing, healthcare, various fees, living expenses, and so on, bring that same estimate up to around $105,000 annually.
$1,000,000,000 invested in a stupid boring index fund at an estimated 4% return yields $40,000,000 in interest alone, or, using the above numbers, enough for 380(.95) students each year.