public static void main ( String [ ] args ) {
  Scanner input = new Scanner ( System . in ) ;
  int n , a , result = 0 ;
  n = input . nextInt ( ) ;
  a = input . nextInt ( ) ;
  if ( n == a || a == 1 ) {
    result = 1 ;
  }
  else if ( a % 2 != 0 ) {
    result = a / 2 + 1 ;
  }
  else if ( a == n / 2 && a % 2 == 0 ) {
    result = a / 2 + 1 ;
  }
  else {
    if ( a > n / 2 ) {
      result = ( n - a ) / 2 + 1 ;
    }
    else if ( a < n / 2 ) {
      result = ( n - a ) / 2 + 1 ;
    }
  }
  System . out . println ( result ) ;
}

public static void main ( String [ ] args ) { Scanner input = new Scanner ( System . in ) ; int n , a , result = 0 ; n = input . nextInt ( ) ; a = input . nextInt ( ) ; if ( n == a || a == 1 ) { result = 1 ; } else if ( a % 2 != 0 ) { result = a / 2 + 1 ; } else if ( a == n / 2 && a % 2 == 0 ) { result = a / 2 + 1 ; } else { if ( a > n / 2 ) { result = ( n - a ) / 2 + 1 ; } else if ( a < n / 2 ) { result = ( n - a ) / 2 + 1 ; } } System . out . println ( result ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier)) declarator: (variable_declarator name: (identifier)) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal)))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal)))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal))))) alternative: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (decimal_integer_literal)) right: (decimal_integer_literal))))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (decimal_integer_literal)) right: (decimal_integer_literal))))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))