/* Assume that the United States of America uses the following income tax code formula for their annual income:
First US$ 5,000 of income: 0% tax
Next US$ 10,000 of income: 10% tax
Next US$ 20,000 of income: 15% tax
Next Amount upto and above US$ 35,000: 20% tax.
For example, somebody earning US$ 38,000 annually would owe
/*Amicable Numbers are two numbers so related that the sum of the proper divisors of the one is equal to the other, unity being considered as a proper divisor but not the number itself. Such a pair is (220, 284).*/