There are many test cases. In each test case, the first line is an integer n (3 <= n <= 1001), which is the number of points on the plane. Then there are n lines. Each contains two floating number x, y, witch is the coordinate of one point. n <= 0 denotes the end of input.
Output
For each test case, output just one line, containing the max angle player1 can get in degree format. The result should be accurated up to 4 demicals.