public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int h = sc . nextInt ( ) ;
  int m = sc . nextInt ( ) ;
  int sum = 0 ;
  int a [ ] = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    a [ i ] = 100 ;
  }
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    int l = sc . nextInt ( ) ;
    int r = sc . nextInt ( ) ;
    int x = sc . nextInt ( ) ;
    for ( int j = l - 1 ;
    j < r ;
    j ++ ) {
      a [ j ] = Math . min ( a [ j ] , x ) ;
    }
  }
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( a [ i ] == 100 ) {
      sum += h * h ;
    }
    else {
      sum += a [ i ] * a [ i ] ;
    }
  }
  System . out . println ( sum ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int h = sc . nextInt ( ) ; int m = sc . nextInt ( ) ; int sum = 0 ; int a [ ] = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { a [ i ] = 100 ; } for ( int i = 0 ; i < m ; i ++ ) { int l = sc . nextInt ( ) ; int r = sc . nextInt ( ) ; int x = sc . nextInt ( ) ; for ( int j = l - 1 ; j < r ; j ++ ) { a [ j ] = Math . min ( a [ j ] , x ) ; } } for ( int i = 0 ; i < n ; i ++ ) { if ( a [ i ] == 100 ) { sum += h * h ; } else { sum += a [ i ] * a [ i ] ; } } System . out . println ( sum ) ; }
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