144. Meeting
time limit per test: 0.25
sec.
Two of the three members
of the winning team of one of the ACM regional contests are going to meet
in order to train for the upcoming World Finals. They decided that they
will meet sometime between X o'clock and Y o'clock. Because
they never get anywhere on time (they were late even on the day of the
regional contest), they did not set an exact time when they will meet.
However, they decided that the one who gets first at the meeting point
will not wait more than Z minutes for the other one (they calculated
that, if the other one will not come within Z minutes from the arrival
of the first of them, then it is very probable that he will not show up
at all).
Input The input will contain 2 integer numbers X and Y (0<=X<Y<=24) and one real number Z ( 0 < Z <= 60*(YX) ). Output You should output the required probability with 7 decimal digits (rounded according to the 8th decimal digit). Sample Input 11 12 20.0 Sample Output 0.5555556  
