B"Many schoolchildren look for a job for the summer, and one day, when Gerald was still a schoolboy, he also decided to work in the summer. But as Gerald was quite an unusual schoolboy, he found quite unusual work. A certain Company agreed to pay him a certain sum of money if he draws them three identical circles on a plane. The circles must not interfere with each other (but they may touch each other). He can choose the centers of the circles only from the n options granted by the Company. He is free to choose the radius of the circles himself (all three radiuses must be equal), but please note that the larger the radius is, the more he gets paid. Help Gerald earn as much as possible. The first line contains a single integer n -- the number of centers (3 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89n xe2 x80 x89 xe2 x89 xa4 xe2 x80 x893000). The following n lines each contain two integers xi, xe2 x80 x89yi ( xe2 x80 x89- xe2 x80 x89104 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89xi, xe2 x80 x89yi xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89104) -- the coordinates of potential circle centers, provided by the Company. All given points are distinct. Print a single real number -- maximum possible radius of circles. The answer will be accepted if its relative or absolute error doesn't exceed 10 xe2 x80 x89- xe2 x80 x896."...