static double e ( int x , int n ) {
  double r ;
  if ( n == 0 ) return 1 ;
  r = e ( x , n - 1 ) ;
  p = p * x ;
  f = f * n ;
  return ( r + p / f ) ;
}

static double e ( int x , int n ) { double r ; if ( n == 0 ) return 1 ; r = e ( x , n - 1 ) ; p = p * x ; f = f * n ; return ( r + p / f ) ; }
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