typedef long long ll;
typedef long double ld;

#include <bits/stdc++.h>
using namespace std;
#define int long long

signed main(){
    ll n,m;
    std::cin >> n>>m;
    vector<ll> lake(n);
    for (int i = 0; i < n; i++) {
        std::cin >> lake[i];
    }
    ll ans = 0;
    for (int i = 0; i < m; i++) {
        ll f,b,w;
        std::cin >> f>>b>>w;
        ll dis = 1e18;
        auto it = lower_bound(lake.begin(),lake.end(),f);
        if(it!=lake.end()){
            dis = min(dis, abs(*it-f));
        }
        if(it!=lake.begin()){
            it--;
            dis = min(dis, abs(*it-f));
        }
        ans += max(b, w-dis);
    }
    std::cout << ans << std::endl;
};