#include <iostream>

namespace math {

  const int one   = 1;
  const int two   = 2;
  const int three = 3;
  const int four  = 4;

  int add ( const int x, const int y ) { return x+y; };

}

namespace wmath {

  const int one   = 4;
  const int two   = 3;
  const int three = 2;
  const int four  = 1;

  int add ( const int x, const int y ) { return x-y; };

}

using namespace std;
using namespace math;

int main() {

  cout << math::one << " " << wmath::one << endl;
  cout << math::add( math::one, math::two ) << endl;
  cout << wmath::add( math::one, math::two ) << endl;
  cout << add( one , two ) << endl;
   
}