Long long ago there are two countrys in the universe. Each country haves its own manor in 3-dimension space. Country A's manor occupys x^2+y^2+z^2<=R^2. Country B's manor occupys x^2+y^2<=HR^2 && |z|<=HZ. There may be a war between them. The occurrence of a war have a certain probability. We calculate the probability as follow steps. 1. VC=volume of insection manor of A and B. 2. VU=volume of union manor of A and B. 3. probability=VC/VU
输入解释
Multi test cases(about 1000000). Each case contain one line. The first line contains three integers R,HR,HZ. Process to end of file.
[Technical Specification] 0< R,HR,HZ<=100
输出解释
For each case，output the probability of the war which happens between A and B. The answer should accurate to six decimal places.