public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int N = sc . nextInt ( ) ;
  int ans = 0 ;
  int count = 0 ;
  boolean watered = false ;
  int [ ] h = new int [ N ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    h [ i ] = sc . nextInt ( ) ;
    if ( h [ i ] == 0 ) {
      count ++ ;
    }
  }
  while ( count < h . length ) {
    for ( int i = 0 ;
    i < N ;
    i ++ ) {
      if ( h [ i ] > 0 ) {
        h [ i ] -- ;
        if ( h [ i ] == 0 ) {
          count ++ ;
        }
        watered = true ;
        continue ;
      }
      if ( watered ) {
        ans ++ ;
        watered = false ;
      }
    }
    if ( watered ) {
      ans ++ ;
      watered = false ;
    }
  }
  out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int N = sc . nextInt ( ) ; int ans = 0 ; int count = 0 ; boolean watered = false ; int [ ] h = new int [ N ] ; for ( int i = 0 ; i < N ; i ++ ) { h [ i ] = sc . nextInt ( ) ; if ( h [ i ] == 0 ) { count ++ ; } } while ( count < h . length ) { for ( int i = 0 ; i < N ; i ++ ) { if ( h [ i ] > 0 ) { h [ i ] -- ; if ( h [ i ] == 0 ) { count ++ ; } watered = true ; continue ; } if ( watered ) { ans ++ ; watered = false ; } } if ( watered ) { ans ++ ; watered = false ; } } out . println ( ans ) ; }
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