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#include <iostream>

using namespace std;

int main()
{
	int n,m,l,r,k;
	int *puszki;
	cin >> n >> m;
	puszki = new int[n];
	for (int i = 0;i<n;++i) puszki[i]=0;
	for (int i = 0;i<m;++i)
	{
		cin >> l >> r >> k;
		for (int j=l-1;j<r;++j)
		{
			if (k==3) ++k;
			puszki[j]|=k;
		}
	}
	int s = 0;
	for (int i = 0;i<n;++i)	
	{
		if (puszki[i]==3) ++s;
	}
	cout << s;
	return 0;
}