import math
class Point:
    def __init__(self, a, b):
        self.x = a
        self.y = b

    def polar_angle(self):
        angle = math.atan2(self.y, self.x)
        if angle < 0:
            return angle + 2 * math.pi
        return angle

x, y = list(map(int, input().split()))
P = Point(x, y)
print(P.polar_angle())