public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int [ ] a = new int [ n ] ;
  int [ ] pos = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int tmp = sc . nextInt ( ) ;
    a [ i ] = tmp ;
    pos [ tmp - 1 ] = i ;
  }
  TreeSet < Integer > ts = new TreeSet < Integer > ( ) ;
  long ans = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    int h , l ;
    if ( ts . higher ( pos [ i ] ) == null ) {
      h = n ;
    }
    else {
      h = ts . higher ( pos [ i ] ) ;
    }
    if ( ts . lower ( pos [ i ] ) == null ) {
      l = - 1 ;
    }
    else {
      l = ts . lower ( pos [ i ] ) ;
    }
    ans += ( long ) ( pos [ i ] - l ) * ( long ) ( h - pos [ i ] ) * ( long ) ( i + 1 ) ;
    ts . add ( pos [ i ] ) ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int [ ] a = new int [ n ] ; int [ ] pos = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { int tmp = sc . nextInt ( ) ; a [ i ] = tmp ; pos [ tmp - 1 ] = i ; } TreeSet < Integer > ts = new TreeSet < Integer > ( ) ; long ans = 0 ; for ( int i = 0 ; i < n ; i ++ ) { int h , l ; if ( ts . higher ( pos [ i ] ) == null ) { h = n ; } else { h = ts . higher ( pos [ i ] ) ; } if ( ts . lower ( pos [ i ] ) == null ) { l = - 1 ; } else { l = ts . lower ( pos [ i ] ) ; } ans += ( long ) ( pos [ i ] - l ) * ( long ) ( h - pos [ i ] ) * ( long ) ( i + 1 ) ; ts . add ( pos [ i ] ) ; } System . out . println ( ans ) ; }
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dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (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: (identifier))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (identifier))))) (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments (type_identifier))) arguments: (argument_list)))) (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)) declarator: (variable_declarator name: (identifier))) (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))) right: (null_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (identifier)))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))) right: (null_literal))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (unary_expression operand: (decimal_integer_literal))))) alternative: (block (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier)))))))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (binary_expression left: (cast_expression type: (integral_type) value: (parenthesized_expression (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (identifier)))) right: (cast_expression type: (integral_type) value: (parenthesized_expression (binary_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))))) right: (cast_expression type: (integral_type) value: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (identifier))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))