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#include <iostream>
using namespace std;
const double PI = 3.14;
int main()
{
char figure;
cin >> figure;
if (figure == 's')
{
double side;
cin >> side;
cout << side * side << endl;
}
else if (figure == 'r')
{
double sideA, sideB;
cin >> sideA >> sideB;
cout << sideA * sideB << endl;
}
else if (figure == 'c')
{
double R;
cin >> R;
cout << PI * R * R << endl;
}
else if (figure == 't')
{
double width;
double height;
cin >> width >> height;
cout << width * height / 2 << endl;
}
else
{
cout << "Invalid figure!" << endl;
}
}
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