#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
	int N,Q;
	cin>>N>>Q;
	int ans = 0;
	vector<int> S(N);
	for(int i=0;i<N;i++) cin>>S[i];
	while(Q--){
		int a,b,c;
		cin>>a>>b>>c;
		c -= b;
		int m = 1e18;
		auto it = lower_bound(S.begin(),S.end(),a);
		if(it != S.end()) m = min(m,(*it)-a);
		if(it != S.begin()){
			it--;
			m = min(m,a-(*it));
		}
		if(m < c) ans += c+b-m;
		else ans += b;
	}
	cout<<ans<<endl;
}