Question: please use python and add comments on every line of code. SumOf3rd: write a program that uses recursion to add the sum of every 3rd

please use python and add comments on every line of code.

SumOf3rd: write a program that uses recursion to add the sum of every 3rd number (counting down) based on a number entered. For example, if the user enters the number 15, the program should calculate the sum of 3rd numbers as 45. (15 + 12 + 9 + 6 + 3). If the number 1 is entered, then the program should return 1. If the number 0 is entered, then the program should return 0. If a number less then zero is entered, prompt the user to enter a positive number. Name your solution sumof3rd.py.

NOTE: solution must use recursion to solve the sumof3rd

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