#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int n, m;
    cin >> n >> m;
    vector<int> l(n+2);
    l[0] = -1e9;
    rep(i,n) cin >> l[i+1];
    l[n+1] = 2e9;
    vector<int> f(m), b(m), w(m);
    rep(i,m) cin >> f[i] >> b[i] >> w[i];
    ll ans = 0;
    rep(i,m){
        int it = lower_bound(l.begin(),l.end(),f[i]) - l.begin();
        dbg(it);
        dbg(l[it]);
        ll dist = min(abs(f[i]-l[it]), abs(f[i]-l[it-1]));
        dbg(dist);
        if(dist<w[i]-b[i]){
            ans += w[i]  - dist;
        }
        else{
            ans += b[i];
        }
    }
    cout << ans << endl;
    return 0;
}