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荔园之美，在春之萌芽，在夏之绽放，在秋之收获，在冬之沉淀
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发信人: westship (" "), 信区: ACMICPC
标 题: 3：Tick and Tick
发信站: 荔园晨风BBS站 (Sat May 22 14:00:44 2004)
The three hands of the clock are rotating every second and meeting each other
many times everyday. Finally, they get bored of this and each of them would li
ke to stay away from the other two. A hand is happy if it is at least D degree
s from any of the rest. You are to calculate how much time in a day that all t
he hands are happy.
Input
The input contains many test cases. Each of them has a single line with a real
number D between 0 and 120, inclusively. The input is terminated with a D of
-1.
Output
For each D, print in a single line the percentage of time in a day that all of
the hands are happy, accurate up to 3 decimal places.
Sample Input
0
120
90
-1
Sample Output
100.000
0.000
6.251
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