#include <iostream>

using namespace std;

namespace myspace
{
	const double PI = 3.141592653589793;
	int    sqr(const int n)    { return n * n; }
	double sqr(const double x) { return x * x; }

	int length(const char* s)
	{
		int n = 0;
		while (*s++) n++;
		return n;
	}
}

namespace other
{
	int sqr(int n) { return n * n * n; }
}

int main()
{
	using namespace myspace;

	int a, b;
	cout << "Pi=";
	cout.precision(8);
	cout << PI << endl;
	cin >> a >> b;
	int c = a + b;
	cout << "c=";
	cout.width(5); cout.fill('_');
	cout << showpos << other::sqr(c) << endl << noshowpos;
	cout << length("ABC");
}