/***************************************************
Areas of Circles and Triangles

Write a program that calculates areas of circles
and triangles, where the use chooses which kind of
object he wants to caclulate areas for.

The area of a circle is Pi r^2, where r is the
radius and Pi is approximately 3.14
The area of a triangle is 1/2 b h, where b is the
length of the base, and h is the height.
***************************************************/
#include <iostream>
using namespace std;

int main()
{
  // Read type of object: circle or triangle
  string s;
  cin >> s;

  if (s == "circle")
  {
    // Compute area of circle
    double r,Pi;
    Pi = 3.14;
    cin >> r;
    cout << "Area equals " << Pi*r*r << endl;
  }
  else
  {
    // Compute area of triangle
    double b,h;
    cin >> b >> h;
    cout << "Area equals " << 1/2.0*b*h << endl;
  }

  return 0;
}