// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include "bits/stdc++.h"
using namespace std;
using ll = long long int;
mt19937_64 rng(chrono::high_resolution_clock::now().time_since_epoch().count());

int main()
{
    ios::sync_with_stdio(false); cin.tie(0);

    int n, m; cin >> n >> m;
    vector<int> pos(n);
    for (int &x : pos) cin >> x;
    ll ans = 0;
    for (int i = 0; i < m; ++i) {
        int y, a, b; cin >> y >> a >> b;
        auto it = lower_bound(begin(pos), end(pos), y);
        int add = a;
        if (it != end(pos)) add = max(add, b - (*it - y));
        if (it != begin(pos)) {
            --it;
            add = max(add, b - (y - *it));
        }
        ans +=add;
    }
    cout << ans << '\n';
}