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#include <bits/stdc++.h>
using namespace std;

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	
	int n, m;
	cin >> n >> m;
	
	vector<vector<int>> add(3, vector<int>(n + 1));
	for(int i = 0; i < m; ++i) {
		int l, r, k;
		cin >> l >> r >> k;
		k--;
		add[k][l]++;
		if(r < n) {
			add[k][r + 1]--;
		}
	}
	
	int ans = 0;
	vector<int> curr(3);
	for(int i = 1; i <= n; ++i) {
		for(int j = 0; j < 3; ++j) {
			curr[j] += add[j][i];
		}
		if(curr[0] > 0 && curr[1] > 0 && curr[2] == 0) {
			ans++;
		}
	}
	
	cout << ans;
	
	return 0;
}