public static void main ( String [ ] args ) {
  FastReader sc = new FastReader ( ) ;
  PrintWriter pw = new PrintWriter ( System . out ) ;
  int n = sc . nextInt ( ) ;
  int m = sc . nextInt ( ) ;
  long arr [ ] = new long [ n + 1 ] ;
  long sum = 0 ;
  for ( int i = 1 ;
  i < n + 1 ;
  i ++ ) {
    arr [ i ] = sc . nextInt ( ) ;
    sum += arr [ i ] ;
  }
  boolean capital [ ] = new boolean [ n + 1 ] ;
  long ans = 0 ;
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    int x = sc . nextInt ( ) ;
    capital [ x ] = true ;
    sum -= arr [ x ] ;
    ans += ( sum * arr [ x ] ) ;
  };
}

public static void main ( String [ ] args ) { FastReader sc = new FastReader ( ) ; PrintWriter pw = new PrintWriter ( System . out ) ; int n = sc . nextInt ( ) ; int m = sc . nextInt ( ) ; long arr [ ] = new long [ n + 1 ] ; long sum = 0 ; for ( int i = 1 ; i < n + 1 ; i ++ ) { arr [ i ] = sc . nextInt ( ) ; sum += arr [ i ] ; } boolean capital [ ] = new boolean [ n + 1 ] ; long ans = 0 ; for ( int i = 0 ; i < m ; i ++ ) { int x = sc . nextInt ( ) ; capital [ x ] = true ; sum -= arr [ x ] ; ans += ( sum * arr [ x ] ) ; } ; }
(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)))) (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) dimensions: (dimensions) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))))) (local_variable_declaration type: (boolean_type) declarator: (variable_declarator name: (identifier) dimensions: (dimensions) value: (array_creation_expression type: (boolean_type) dimensions: (dimensions_expr (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (true))) (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (parenthesized_expression (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier))))))))))