// namespaces
#include <iostream>
using namespace std;

namespace first
{
  int var = 5;
}

namespace first
{
  int var2 = 7;
}

namespace second
{
  double var = 3.1416;
  double var2 = 2*var;
}

int main () {
  cout << first::var << endl;
  cout << second::var << endl;
  cout << first::var2 << endl;
  cout << second::var2 << endl;

  return 0;
}