DWITE Contest

Test Case for Question #1 in DWITE 2009-2010 High School Round 2

Contest: DWITE 2009-2010 High School Round 2
Question: #1
Input File: DATA1.txt
Output File: OUT1.txt


Input

-100 0 0 -100
0 100 0 -100
100 0 71 71
71 71 100 0
100 8 100 0




Output

270.0
180.0
315.0
45.0
4.6