circle 5

78.5

class Shape:
    def area(self):
        return 0

class Circle(Shape):
    def __init__(self, r):
        self.r = r
    def area(self):
        return round(3.14 * self.r ** 2, 2)

class Rectangle(Shape):
    def __init__(self, w, h):
        self.w = w
        self.h = h
    def area(self):
        return round(self.w * self.h, 2)

parts = input().split()
shape_type = parts[0]
if shape_type == 'circle':
    s = Circle(float(parts[1]))
else:
    s = Rectangle(float(parts[1]), float(parts[2]))
print(s.area())