import sys, time, random
from collections import deque, Counter, defaultdict
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 63 - 1
mod = 998244353
import bisect
n, m = mi()

l = li()
l.sort()
l.insert(0,-inf)
l.append(inf)
ans = 0
for i in range(m):
    f, b, w = mi()
    ans += max(b, w - abs(l[bisect.bisect(l, f)] - f), w - abs(l[bisect.bisect(l, f) - 1] - f))

print(ans)