#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <tuple>
#include <cmath>
#include <numeric>
#include <functional>
#include <cassert>

#define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl;
#define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

using namespace std;
typedef long long ll;

template<typename T>
vector<vector<T>> vec2d(int n, int m, T v){
    return vector<vector<T>>(n, vector<T>(m, v));
}

template<typename T>
vector<vector<vector<T>>> vec3d(int n, int m, int k, T v){
    return vector<vector<vector<T>>>(n, vector<vector<T>>(m, vector<T>(k, v)));
}

template<typename T>
void print_vector(vector<T> v, char delimiter=' '){
    if(v.empty()) {
        cout << endl;
        return;
    }
    for(int i = 0; i+1 < v.size(); i++) cout << v[i] << delimiter;
    cout << v.back() << endl;
}

const ll inf = 1e18;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(10) << fixed;
    int n, m; cin >> n >> m;
    vector<ll> l(n);
    for(int i = 0; i < n; i++) cin >> l[i];
    vector<ll> f(m), b(m), w(m);
    for(int i = 0; i < m; i++) cin >> f[i] >> b[i] >> w[i];
    set<ll> st;
    for(int i = 0; i < n; i++) st.insert(l[i]);
    ll ans = 0;
    for(int i = 0; i < m; i++){
        auto p = st.lower_bound(f[i]);
        ll min_power = inf;
        if(p != st.end()){
            chmin(min_power, (*p)-f[i]);
        }
        if(p != st.begin()){
            p--;
            chmin(min_power, f[i]-(*p));
        }
        ans += max(b[i], w[i]-min_power);
    }
    cout << ans << endl;
}