#include <iostream>
using namespace std;

int value = 100;


int add( int x1, int x2 )
{
	cout  << x1 << endl ;
	return ( x1 + x2 ) ;
}
namespace group1
	{
	  int value = 10 ;
    }

int main()
{

    cout << group1::value << endl ;
    cout << add( 4, 5 ) << endl  ;
    cout << value << endl ;
    cout << ::value << endl ;


	return 0;
}