#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001



int main(){
	
	int n,m;
	cin>>n>>m;
	vector<long long> l(n);
	rep(i,n)cin>>l[i];
	l.insert(l.begin(),-Inf64);
	l.push_back(Inf64);
	long long ans = 0;
	rep(i,m){
		long long f,x,y;
		cin>>f>>x>>y;
		
		int d = distance(l.begin(),lower_bound(l.begin(),l.end(),f));
		long long nn = min(abs(f-l[d]),abs(f-l[d-1]));
		ans += max(x,y-nn);
		
	}
	cout<<ans<<endl;
	
	return 0;
}