"""
This example is from Prof. John DeNero's lecture video:
https://www.youtube.com/watch?v=BTGJ_esCPWI
"""

def f(x):
    return g(x - 1)

def g(y):
    return abs(h(y) - h(1 / y))

def h(z):
    return z * z

print(f(12))
# print(f(1))