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#include <iostream>
using namespace std;

struct Colors {
	int yellow = 0;
	int blue = 0;
	int red = 0;
};

Colors baskets[1'000'010];

int main() {
	ios_base::sync_with_stdio(false);
	int n, m;
	cin >> n >> m;
	for(int i = 0; i < m; ++i) {
		int a, b, c;
		cin >> a >> b >> c;
		if(c == 1) {
			baskets[a].yellow += 1;
			baskets[b+1].yellow -= 1;
		} else if(c == 2) {
			baskets[a].blue += 1;
			baskets[b+1].blue -= 1;
		} else {
			baskets[a].red += 1;
			baskets[b+1].red -= 1;
		}
	}
	
	int x = 0, y = 0, z = 0, res = 0;
	for(int i = 1; i <= n; ++i) {
		x += baskets[i].yellow;
		y += baskets[i].blue;
		z += baskets[i].red;
		
		if(x > 0 && y > 0 && z == 0) {
			++res;
		}
	}
	cout << res << endl;
	return 0;
}