#include <iostream>
using namespace std;
int n, p, ans = -1, a[5000005];
int main() {
	cin >> n >> p;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
	}
	for (int i = 1; i <= p; i++) {
		int x, y, z;
		cin >> x >> y >> z;
		for (int j = x; j <= y; j++) {
			a[j] += z;
		}
	}
	for (int i = 1; i <= n; i++) {
		if (a[i] > ans) {
			ans = a[i];
		}
	}
	cout << ans;
	return 0;
}

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