Question: Read the information for three geometrical shapes, find the one with the largest area. You will be given the radius of a circle, base and height of a triangle and the two sides of a rectangle, Find the one with the greatest area.

Input specification: The information for each shape is given in a line.

• the radius of a circle (rad): an integer,
• base and height of a triangle: two integers,
• two sides of a rectangle: two integers

Output specification: Show one floating number with two digits precision, the area of the largest object.

Explanation: for the first sample:

• Area of the circle is: 380.13
• Area of the triangle is: 570
• Area of the rectangle is: 50 * 43 = 2,150