private static void findCount ( int n , int sum ) {
  int start = ( int ) Math . pow ( 10 , n - 1 ) ;
  int end = ( int ) Math . pow ( 10 , n ) - 1 ;
  int count = 0 ;
  int i = start ;
  while ( i < end ) {
    int cur = 0 ;
    int temp = i ;
    while ( temp != 0 ) {
      cur += temp % 10 ;
      temp = temp / 10 ;
    }
    if ( cur == sum ) {
      count ++ ;
      i += 9 ;
    }
    else i ++ ;
  }
  System . out . println ( count ) ;
}

private static void findCount ( int n , int sum ) { int start = ( int ) Math . pow ( 10 , n - 1 ) ; int end = ( int ) Math . pow ( 10 , n ) - 1 ; int count = 0 ; int i = start ; while ( i < end ) { int cur = 0 ; int temp = i ; while ( temp != 0 ) { cur += temp % 10 ; temp = temp / 10 ; } if ( cur == sum ) { count ++ ; i += 9 ; } else i ++ ; } System . out . println ( count ) ; }
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