DWITE Contest

Test Case for Question #1 in DWITE 2007-2008 High School Round 4

Contest: DWITE 2007-2008 High School Round 4
Question: #1
Input File: DATA1.txt
Output File: OUT1.txt


Input

0 50
25 50
40 50
60 50
90 50




Output

0
195
251
221
0