public static void main ( String [ ] args ) {
  Scanner scan = new Scanner ( System . in ) ;
  int N = scan . nextInt ( ) ;
  int [ ] a = new int [ N ] ;
  for ( int i = 0 ;
  i < N ;
  ++ i ) {
    a [ i ] = scan . nextInt ( ) ;
  }
  int [ ] leftl = new int [ N ] ;
  int [ ] rightl = new int [ N ] ;
  ArrayDeque < Integer > que = new ArrayDeque < > ( ) ;
  int index = 0 ;
  while ( index < N ) {
    while ( ! que . isEmpty ( ) && a [ que . peek ( ) ] > a [ index ] ) {
      int ind = que . poll ( ) ;
      rightl [ ind ] = index - ind - 1 ;
    }
    que . push ( index ++ ) ;
  }
  while ( ! que . isEmpty ( ) ) {
    int ind = que . poll ( ) ;
    rightl [ ind ] = N - ind - 1 ;
  }
  index = N - 1 ;
  while ( index >= 0 ) {
    while ( ! que . isEmpty ( ) && a [ que . peek ( ) ] > a [ index ] ) {
      int ind = que . poll ( ) ;
      leftl [ ind ] = ind - index - 1 ;
    }
    que . push ( index -- ) ;
  }
  while ( ! que . isEmpty ( ) ) {
    int ind = que . poll ( ) ;
    leftl [ ind ] = ind - index - 1 ;
  }
  long ans = 0 ;
  for ( int i = 0 ;
  i < N ;
  ++ i ) {
    ans += ( long ) a [ i ] * ( leftl [ i ] + 1 ) * ( rightl [ i ] + 1 ) ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner scan = new Scanner ( System . in ) ; int N = scan . nextInt ( ) ; int [ ] a = new int [ N ] ; for ( int i = 0 ; i < N ; ++ i ) { a [ i ] = scan . nextInt ( ) ; } int [ ] leftl = new int [ N ] ; int [ ] rightl = new int [ N ] ; ArrayDeque < Integer > que = new ArrayDeque < > ( ) ; int index = 0 ; while ( index < N ) { while ( ! que . isEmpty ( ) && a [ que . peek ( ) ] > a [ index ] ) { int ind = que . poll ( ) ; rightl [ ind ] = index - ind - 1 ; } que . push ( index ++ ) ; } while ( ! que . isEmpty ( ) ) { int ind = que . poll ( ) ; rightl [ ind ] = N - ind - 1 ; } index = N - 1 ; while ( index >= 0 ) { while ( ! que . isEmpty ( ) && a [ que . peek ( ) ] > a [ index ] ) { int ind = que . poll ( ) ; leftl [ ind ] = ind - index - 1 ; } que . push ( index -- ) ; } while ( ! que . isEmpty ( ) ) { int ind = que . poll ( ) ; leftl [ ind ] = ind - index - 1 ; } long ans = 0 ; for ( int i = 0 ; i < N ; ++ i ) { ans += ( long ) a [ i ] * ( leftl [ i ] + 1 ) * ( rightl [ i ] + 1 ) ; } System . out . println ( ans ) ; }
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