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Matcom Online Grader
Faculty of Mathematics and Computer Science of University of Havana
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E - Electric Bill
Languages: C, C++, Java, Pascal, Python, Tiger, JavaScript, Haskell, C#
Time & Memory limits: (details)
It’s year 2100. Electricity has become very expensive. Recently, your electricity company raised the power rates once more. The table below shows the new rates (consumption is always a positive integer):
This means that, when calculating the amount to pay, the first $100$ CWh have a price of $2$ Americus each; the next $9900$ CWh (between $101$ and $10000$) have a price of $3$ Americus each and so on.
For instance, if you consume $10123$ CWh you will have to pay $2 \times 100 + 3 \times 9900 + 5 \times 123 = 30515$ Americus.
The evil mathematicians from the company have found a way to gain even more money. Instead of telling you how much energy you have consumed and how much you have to pay, they will show you two numbers related to yourself and to a random neighbor:
A: the total amount to pay if your consumptions were billed together; and
B: the absolute value of the difference between the amounts of your bills.
If you can’t figure out how much you have to pay, you must pay another $100$ Americus for such a “service”. You are very economical, and therefore you are sure you cannot possibly consume more than any of your neighbors. So, being smart, you know you can compute how much you have to pay. For example, suppose the company informed you the following two numbers: $A = 1100$ and $B = 300$. Then you and your neighbor’s consumptions had to be $150$ CWh and $250$ CWh respectively. The total consumption is $400$ CWh and then $A$ is $2 \times 100 + 3 \times 300 = 1100$. You have to pay $2 \times 100 + 3 \times 50 = 350$ Americus, while your neighbor must pay $2 \times 100 + 3 \times 150 = 650$ Americus, so $B$ is $|350 - 650| = 300$.
Not willing to pay the additional fee, you decided to write a computer program to find out how much you have to pay.
Input
The input contains several test cases. Each test case is composed of a single line, containing two integers $A$ and $B$, separated by a single space, representing the numbers shown to you $(1 \leq A, B \leq 10^9)$. You may assume there is always a unique solution, that is, there exists exactly one pair of consumptions that produces those numbers.
The last test case is followed by a line containing two zeros separated by a single space.
Output
For each test case in the input, your program must print a single line containing one integer, representing the amount you have to pay.
Sample test(s)
Input
1100 300
35515 27615
0 0
Output
350
2900