import numpy as np


# https://maspypy.com/%E6%95%B0%E5%AD%A6%E3%83%BBnumpy-%E9%AB%98%E9%80%9F%E3%83%95%E3%83%BC%E3%83%AA%E3%82%A8%E5%A4%89%E6%8F%9Bfft%E3%81%AB%E3%82%88%E3%82%8B%E7%95%B3%E3%81%BF%E8%BE%BC%E3%81%BF


n, m, x = map(int, input().split())
c_list = list(map(int, input().split()))
aby_list = [tuple(map(int, input().split())) for _ in range(m)]

colors = np.zeros((n, 5), dtype=np.int32)
for i, c in enumerate(c_list):
	colors[i, c - 1] = 1
score = np.zeros((n, 5), dtype=np.int32)
for a, b, y in aby_list:
	score[a - 1, b - 1] += y


fft_len = 1
while 2 * fft_len < 2 * n - 1:
	fft_len *= 2
fft_len *= 2

h = np.zeros((fft_len, 5), dtype=np.int32)
for c in range(5):
	Fsc = np.fft.rfft(score[:, c], fft_len)
	Fco = np.fft.rfft(colors[::-1, c], fft_len)
	h[:, c] = np.rint(np.fft.irfft(Fsc * Fco, fft_len)).astype(np.int32)

hs = h.sum(axis=1)
res = n * x

for j in range(n - 1, -1, -1):
	res = max(res, hs[j] + (n - 1 - j) * x)

print(res)