Let's do some magic

Question

You have a magic box that doubles the count of items you put, in every day.
The given program takes the initial count of the items and the number of days as input.

Task
Write a program to calculate and output items' count on the last day.

Sample Input
3
2

Sample Output
12

Explanation
Day 1: 6 (3*2)
Day 2: 12 (6*2)

Solution: days = int(input())
items = int(input())
While days > 0:
items = items*2
days = days - 1
print(items)

Can someone explain why "days -= 1" in the code ? I don't understand.

Answer 1

The while loop is counting down the days as it doubles the items.