|Contests||Virtual Contests||Problems||Submit||Runs Status||Rank List||Forum|
You may assume that the telephone post is at coordinates (0,0), where the first dimension is North/South and the second dimension is East/West. The coordinates of the Frosh are given in metres relative to the post. There are no more than 256 Frosh.
The input consists of a line specifying the number of Frosh, followed by one line per Frosh with two real numbers indicating his or her position.
Process to the end of file.
The output for each case consists of a single number - the length of silk in metres, to two decimal places.