At each iteration of the loop, an integer is entered. It is necessary to calculate the product of only positive numbers, until the value 0 is entered. Implement skipping calculations using the continue statement, and also use a while loop. Display the result of the work.

def multiply():
  res = 1
  while True:
    num = int(input("Enter number: "))
    if num == 0:
      break
    elif num < 0:
      continue
    res = res * num
  return res

multiply()