public static void main ( String [ ] args ) {
  Scanner puttingvaluesinside = new Scanner ( System . in ) ;
  int n = puttingvaluesinside . nextInt ( ) ;
  if ( n == 1 ) {
    if ( puttingvaluesinside . nextInt ( ) == 1 ) System . out . println ( "YES" ) ;
    else System . out . println ( "NO" ) ;
  }
  else {
    int count = 0 ;
    while ( n -- > 0 ) {
      if ( puttingvaluesinside . nextInt ( ) == 0 ) count ++ ;
    }
    if ( count == 1 ) System . out . println ( "YES" ) ;
    else System . out . println ( "NO" ) ;
  }
}

public static void main ( String [ ] args ) { Scanner puttingvaluesinside = new Scanner ( System . in ) ; int n = puttingvaluesinside . nextInt ( ) ; if ( n == 1 ) { if ( puttingvaluesinside . nextInt ( ) == 1 ) System . out . println ( " YES " ) ; else System . out . println ( " NO " ) ; } else { int count = 0 ; while ( n -- > 0 ) { if ( puttingvaluesinside . nextInt ( ) == 0 ) count ++ ; } if ( count == 1 ) System . out . println ( " YES " ) ; else System . out . println ( " NO " ) ; } }
(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)))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal))) consequence: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) alternative: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))))) alternative: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (binary_expression left: (update_expression (identifier)) right: (decimal_integer_literal))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal))) consequence: (expression_statement (update_expression (identifier)))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) alternative: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))))))))