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


using LL = long long int;
using uLL = unsigned long long int;
using uint = unsigned int;
using ld = long double;

const int N = 1000007;

int color[N][3], tab[3];

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