private static int findLeastDivisibleRepunit ( int n ) {
  if ( n % 2 == 0 || n % 5 == 0 ) return 0 ;
  if ( n > Integer . MAX_VALUE / 10 ) throw new IllegalArgumentException ( "Arithmetic overflow" ) ;
  int sum = 1 ;
  int pow = 1 ;
  int k = 1 ;
  while ( sum % n != 0 ) {
    k ++ ;
    pow = pow * 10 % n ;
    sum = ( sum + pow ) % n ;
  }
  return k ;
}

private static int findLeastDivisibleRepunit ( int n ) { if ( n % 2 == 0 || n % 5 == 0 ) return 0 ; if ( n > Integer . MAX_VALUE / 10 ) throw new IllegalArgumentException ( " Arithmetic ▁ overflow " ) ; int sum = 1 ; int pow = 1 ; int k = 1 ; while ( sum % n != 0 ) { k ++ ; pow = pow * 10 % n ; sum = ( sum + pow ) % n ; } return k ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal)) right: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal)))) consequence: (return_statement (decimal_integer_literal))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (binary_expression left: (field_access object: (identifier) field: (identifier)) right: (decimal_integer_literal)))) consequence: (throw_statement (object_creation_expression type: (type_identifier) arguments: (argument_list (string_literal))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal))) body: (block (expression_statement (update_expression (identifier))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) right: (identifier)))))) (return_statement (identifier))))