#include<stdio.h>
long long int gcd(long long int a, long long int b)
{
	long long int r = a % b;
	while (r > 0)
	{
		a = b;
		b = r;
		r = a % b;
	}
	return b;
}
long long int t[500005], s[1000006];
long long int p[1000006];
long long int used[1000006];
long long int cyc[1000006], cc;
int main()
{
	long long int n, m;
	scanf("%lld %lld", &n, &m);
	t[0] = 0;
	long long int i, j, k;
	for (i = 0; i < m; i++)
	{
		scanf("%lld", &t[i + 1]);
		t[i + 1] += t[i];
		for (j = t[i]; j < t[i + 1]; j++)
		{
			scanf("%lld", &s[j]);
			s[j]--;
		}
	}
	for (i = 0; i < n; i++)
		p[i] = i;
	for (i = 0; i < m; i++)
	{
		k = p[s[t[i + 1] - 1]];
		for (j = t[i + 1] - 1; j > t[i]; j--)
			p[s[j]] = p[s[j - 1]];
		p[s[t[i]]] = k;
 	}
	long long int cnt;
	const long long int prime = 998244353;
	for (i = 0; i < n; i++)
		used[i] = 0;
	cc = 0;
	for (i = 0; i < n; i++)
	{
		if (used[i] > 0)
			continue;
		for (j = i, cnt = 0; used[j] == 0; j = p[j])
		{
			used[j]++;
			cnt++;
		}
		cyc[cc] = cnt;
		cc++;
	}
	long long int g = cyc[0];
	for (i = 0; i < cc; i++)
		g = gcd(g, cyc[i]);
	long long int ans = g;
	for (i = 0; i < cc; i++)
		ans = cyc[i] / g * ans % prime;
	printf("%lld\n", ans);
	return 0;
}