How to display user inputs

Question

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hi iv got a problem with a homework question the question is:

Write a script that asks the user to enter positive real numbers until their product becomes is
greater than 500. The program should check if a negative number is entered, give a warning
and then ask for another number. When a value of 500 is exceeded, the program should
display the product of the numbers, state how many numbers were entered, and list the
numbers. Use fprintf commands to display results and make the output look tidy.

Here's what iv got so far.

r=500;
cnt=0;
n=input('Enter a positive integer: ');
while n<r,
  if n<0
      disp('Invalid number')
      n=input('Enter a positive integer: ');
  elseif n>0
      n=n*n;
      cnt=cnt+1;
      disp(n);
  end
end
fprintf('product=%i\n',n)
fprintf('numbers entered=%i\n',cnt)