Can someone explain how this recursive function output is 12? Recursion is hard for me

C++ Programming: From Problem Analysis to Program Design
8th Edition
ISBN:9781337102087
Author:D. S. Malik
Publisher:D. S. Malik
Chapter15: Recursion
Section: Chapter Questions
Problem 7SA
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Can someone explain how this recursive function output is 12? Recursion is hard for me

def R(n):
    if n>=5:
        return 2
    return R(n+1) + 2

print(R(0))

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