#include <iostream>
using namespace std;

void function1( int x1=4 , int x2= 5 , int x3=6 )
{
	cout << x1 + x2 + x3 << endl ;
}

int main()
{
	function1(  ) ;
	function1( 2 ) ;
	function1( 3 , 4 ) ;
	function1( 3 , 4 ,  5) ;
	return(1) ;
}