Gallup
Often, we see results of gallups, like this:

Prefer red: 3.5%

Prefer green: 4.5%

Prefer yellow: 22.0%

Prefer blue: 70.0%
and you begin to wonder: how many people did they really ask? If the numbers are simple, like 20%, 40%, and 40%, you know that they asked 5 people (or 10, or 15, or more, but we are interested in the minimum number of people).
Your task is to write a program that reads sets of percentages and calculates the smallest number of people that could produce the given percentages. We know that this number is always less than $10\, 000$.
Input
The input is a set of percentages. Each set is on a line of its own. Every line starts with an integer $n$ ($0 \le n \le 20$) giving the number of percentages in the set. $n = 0$ will (only) appear as the final line of input, and you should not output anything for this line. For $n > 0$, the percentages follow as $n$ numbers; these numbers may have 05 decimals, and all percentages in a set have the same number of decimals. (If there are no decimals, there is no decimal point.) The percentages always add up to about 100% as there may be small rounding errors. Numbers are rounded when digits are removed; they are rounded upwards if the first removed digit is 5 or more. Thus, 4.472 is rounded to 4.47, 4.5, or 4, depending on how many digits you want.
Output
For each set of data, print a line starting with “Case $i$:”, where $i$ is the data set’s number. Then follows a space and an integer giving the computed number of people. If no legal answer in the range 19999 exists, print “error” instead of the number.
Sample Input 1  Sample Output 1 

3 20 40 40 3 33.3 33.3 33.3 2 33 67 1 100.0000 4 3.75 4.25 22.00 70.00 2 49 51 2 50 51 2 49 50 0 
Case 1: 5 Case 2: 3 Case 3: 3 Case 4: 1 Case 5: 400 Case 6: 35 Case 7: 200 Case 8: error 