#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define sec second
#define pairz pair<ll,ll>
#define pb push_back
ll tc = 1;
const ll INF = 1e18;
const ll N = 1e6+5;
const ll MOD = 1e9 + 7;
 
// thy will, not mine, be done.

void input(){
	ll n,m; cin >> n >> m;
	set<ll>st;
	for(int i=1;i<=n;i++){
		ll x; cin >> x;
		st.insert(x);
	}
	ll ans = 0;
	for(int i=1;i<=m;i++){
		ll f,b,w; cin >> f >> b >> w;
		auto x = st.lower_bound(f);
		auto y = x;
		if(x == st.end()) --y;
		if(x != st.begin()) --x;
		if(*y == f) ans += w;
		else{
			ans += max({b, w - abs(f - *y), w - abs(f - *x)});
		}
	}
	cout << ans << endl;
}	
 
int main(){
	ios_base::sync_with_stdio(false); cin.tie(nullptr);
   	// cin >> tc;
    while(tc--) input();
}
/*
usahain clean code, jangan ribet2 implementasinya
11 + 14 + 8 = 33
2023 - 2013 2
*/