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#include <cstdio>

#define N 1000000 + 10

int puszki[N][4];

int main() {
	int n, m;

	scanf("%d %d", &n, &m);

	for (int i = 0; i < m; i++) {
		int l, r, k;

		scanf("%d %d %d", &l, &r, &k);
		puszki[l][k]++;
		puszki[r+1][k]--;
	}

	int wynik = 0;
	for (int i = 1; i <= n; i++) {
		for (int kolor = 1; kolor <= 3; kolor++) {
			puszki[i][kolor] += puszki[i-1][kolor];
		}

		if (puszki[i][1] > 0 && puszki[i][2] > 0 && puszki[i][3] == 0) {
			wynik++;
		}
	}

	printf("%d", wynik);

	return 0;
}