#include <iostream>
using namespace std;

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

int main()
{ 
  function1( 4 ) ;  
  function1( 4 , 15 ) ; 
  function1( 4 , 15 , 7) ;
  return(1) ;
  
}