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#include<iostream>

using namespace std;

int main(){
	
	int n, m;
	cin >> n >> m;
	int tab[n] = { };
	for(int i=0; i<m; i++){
		int l, r, k;
		cin >> l >> r >> k;
		if(k==3){
			k=4;
		}
		for(int j=l-1; j<r; j++){
			tab[j] = tab[j] | k;
		}
	}
	int result = 0;
	for(int i=0; i<n; i++){
		if(tab[i] == 3){
			result += 1;
		}
	}
	cout << result << "\n";

}