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#include <bits/stdc++.h>

constexpr int HIGH = 1;
constexpr int NONE = 0;
constexpr int LOW = -1;

struct Marker {
	int c[3] = {NONE,NONE,NONE};
};

Marker C[1000005];

int main()
{
	std::ios_base::sync_with_stdio(0);

	int n;
	std::cin >> n;

	int m;
	std::cin >> m;

	for(int i=0; i<m; i++)
	{
		int a, b, k;

		std::cin >> a >> b >> k;

		a--;
		k--;

		C[a].c[k] += HIGH;
		C[b].c[k] += LOW;
	}

	int kv[3] = {0,0,0};

	int r = 0;

	for(int i=0;i<n;i++)
	{
		for(int j=0;j<3;j++)
		{
			/*if(C[i].c[j] == HIGH)
			{
				kv[j]++;
			}*/
			kv[j]+=C[i].c[j];
			//std::clog << "C[" << i << "].c[" << j << "]=" << C[i].c[j] << "\t\t";

		}
		/*for(int j=0;j<3;j++)
		{
			std::clog << "kv[" << j << "]=" << kv[j] << " ";
		}*/
		if(kv[0]>0 && kv[1]>0 && kv[2]==0)
		{
			r++;
			//std::clog << "\tHIT";
		}
		/*for(int j=0;j<3;j++)
		{
			if(C[i].c[j] == LOW)
			{
				kv[j]--;
			}
		}*/
		//std::clog << "\n";
	}

	std::cout << r << "\n";

	return 0;
}