def binary_search(T: list, t: int) -> int:   # T: ソートされたリスト
    l, r = 0, len(T)
    while l < r:
        m = (l + r) // 2
        if T[m] < t:
            l = m + 1
        else:
            r = m
    return l


N, M = map(int, input().split())
L = sorted(list(map(int, input().split())))
s = set(L)
F = [list(map(int, input().split())) for _ in range(M)]

ans = 0
for f, b, w in F:
    idx = binary_search(L, f)
    mi = float('inf')
    if idx < N:
        mi = min(mi, abs(L[idx]-f))
    if idx + 1 < N:
        mi = min(mi, abs(L[idx+1]-f))
    if 0 <= idx - 1:
        mi = min(mi, abs(L[idx-1]-f))
    ans += max(b, w-mi)
print(ans)