from bisect import bisect_left
from collections import defaultdict

N, M = map(int, input().split())
L = list(map(int, input().split())) 
L.sort()
mi = L[0]
ma = L[-1]
d = defaultdict(int) 
for i in range(N):
    d[L[i]] += 1
ans = 0 
for i in range(M):
    f, b, w = map(int, input().split())  
    if f in d:
        ans += w     
    else:
        if f > ma:
            ans += max(w-abs(f-ma), b)
        elif mi > f:
            ans += max(w-abs(f-mi), b)
        else:
            e = bisect_left(L, f)          
            ans += max(w-abs(L[e]-f), w-abs(L[e-1]), b)

print(ans)