Problem:
Score : 300 points

Problem Statement

Given are positive integers N, M, Q, and Q quadruples of integers ( a_i , b_i , c_i , d_i ).

Consider a sequence A satisfying the following conditions:

A is a sequence of N positive integers.

1 \leq A_1 \leq A_2 \le \cdots \leq A_N \leq M.

Let us define a score of this sequence as follows:

The score is the sum of d_i over all indices i such that A_{b_i} - A_{a_i} = c_i. (If there is no such i, the score is 0.)

Find the maximum possible score of A.

Constraints

All values in input are integers.

2 ≤ N ≤ 10

1 \leq M \leq 10

1 \leq Q \leq 50

1 \leq a_i < b_i \leq N ( i = 1, 2, ..., Q )

0 \leq c_i \leq M - 1 ( i = 1, 2, ..., Q )

(a_i, b_i, c_i) \neq (a_j, b_j, c_j) (where i \neq j)

1 \leq d_i \leq 10^5 ( i = 1, 2, ..., Q )

Input

Input is given from Standard Input in the following format:

N M Q
a_1 b_1 c_1 d_1
:
a_Q b_Q c_Q d_Q

Output

Print the maximum possible score of A.

Sample Input 1

3 4 3
1 3 3 100
1 2 2 10
2 3 2 10

Sample Output 1

110

When A = \{1, 3, 4\}, its score is 110. Under these conditions, no sequence has a score greater than 110, so the answer is 110.

Sample Input 2

4 6 10
2 4 1 86568
1 4 0 90629
2 3 0 90310
3 4 1 29211
3 4 3 78537
3 4 2 8580
1 2 1 96263
1 4 2 2156
1 2 0 94325
1 4 3 94328

Sample Output 2

357500

Sample Input 3

10 10 1
1 10 9 1

Sample Output 3

1

Solution in Haskell (GHC 8.8.3) (judge verdict: Accepted)

type Condition = (Int, Int, Int, Int)

main = do
  [n, m, q] <- readIntegers
  conditions <- readConditions q
  let sequences = probableSequences 1 m n
  print $ foldl max 0 $ map (evaluateSequence conditions) sequences

readIntegers :: IO [Int]
readIntegers = (map read . words) <$> getLine::IO [Int]

readConditions :: Int -> IO [Condition]
readConditions n
  | n <= 0 = return []
  | otherwise = do
    [a, b, c, d] <- readIntegers
    next <- readConditions (n - 1)
    return ((a, b, c, d) : next)

probableSequences :: Int -> Int -> Int -> [[Int]]
probableSequences _ _ 0 = [[]]
probableSequences mMin mMax n = concat $ map (\m -> map (m:) $ probableSequences m mMax (n - 1)) [mMin..mMax]

evaluateSequence :: [Condition] -> [Int] -> Int
evaluateSequence conditions sequence = foldl (+) 0 $ map (scoreForCondition sequence) conditions

scoreForCondition :: [Int] -> Condition -> Int
scoreForCondition sequence (a, b, c, d) =
  if sequence !! (b - 1) - sequence !! (a - 1) == c
    then d
    else 0