# Distant Galaxy

Time Limit: 1000MS

Memory Limit: 65536K

## Description

You are observing a distant galaxy using a telescope above the Astronomy Tower, and you think that a rectangle drawn in that galaxy whose edges are parallel to coordinate axes and contain maximum star systems on its edges has a great deal to do with the mysteries of universe. However you do not have the laptop with you, thus you have written the coordinates of all star systems down on a piece of paper and decide to work out the result later. Can you finish this task?

## Input

There are multiple test cases in the input file. Each test case starts with one integer N, (1 ≤ N ≤ 100), the number of star systems on the telescope. N lines follow, each line consists of two integers: the X and Y coordinates of the Kth planet system. The absolute value of any coordinate is no more than 109, and you can assume that the planets are arbitrarily distributed in the universe.N = 0 indicates the end of input file and should not be processed by your program.

## Output

For each test case, output the maximum value you have found on a single line in the format as indicated in the sample output.

## Sample Input

10
2 3
9 2
7 4
3 4
5 7
1 5
10 4
10 6
11 4
4 6
0

## Sample Output

Case 1: 7

N/A