public static void main ( String [ ] args ) {
  Scanner scan = new Scanner ( System . in ) ;
  int b = scan . nextInt ( ) ;
  int g = scan . nextInt ( ) ;
  int n = scan . nextInt ( ) ;
  if ( n > ( b + g ) ) System . out . println ( "0" ) ;
  else if ( n == b + g ) System . out . println ( "1" ) ;
  else if ( n <= b && n <= g ) {
    System . out . println ( n + 1 ) ;
  }
  else if ( n > b && n > g ) {
    if ( b > g ) {
      System . out . println ( g - ( n - b ) + 1 ) ;
    }
    else {
      System . out . println ( b - ( n - g ) + 1 ) ;
    }
  }
  else if ( g <= b && g <= n ) System . out . println ( g + 1 ) ;
  else if ( b <= g && b <= n ) System . out . println ( b + 1 ) ;
}

public static void main ( String [ ] args ) { Scanner scan = new Scanner ( System . in ) ; int b = scan . nextInt ( ) ; int g = scan . nextInt ( ) ; int n = scan . nextInt ( ) ; if ( n > ( b + g ) ) System . out . println ( "0" ) ; else if ( n == b + g ) System . out . println ( "1" ) ; else if ( n <= b && n <= g ) { System . out . println ( n + 1 ) ; } else if ( n > b && n > g ) { if ( b > g ) { System . out . println ( g - ( n - b ) + 1 ) ; } else { System . out . println ( b - ( n - g ) + 1 ) ; } } else if ( g <= b && g <= n ) System . out . println ( g + 1 ) ; else if ( b <= g && b <= n ) System . out . println ( b + 1 ) ; }
(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) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))))) consequence: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier)))) consequence: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (binary_expression left: (identifier) right: (identifier)))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal)))))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (binary_expression left: (identifier) right: (identifier)))) consequence: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (identifier)))) right: (decimal_integer_literal)))))) alternative: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (identifier)))) right: (decimal_integer_literal)))))))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (binary_expression left: (identifier) right: (identifier)))) consequence: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal))))) alternative: (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (binary_expression left: (identifier) right: (identifier)))) consequence: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal)))))))))))))