import std;
void main(){
  auto input = readln.chomp.split.to!(int[]);
  int n = input[0];
  int m = input[1];
  auto s = new int[n];
  for(auto i = 0; i < n; i++){
    s[i] = i;
  }
  for(auto i = 0; i < m; i++){
    input = readln.chomp.split.to!(int[]);
    int prev = s[input[$ - 1] - 1];
    for(auto j = 1; j < input.length; j++){
      auto t = s[input[j] - 1];
      s[input[j] - 1] = prev;
      prev = t;
    }
  }
  ulong result = 1;
  auto closed = new bool[n];
  for(auto i = 0; i < n; i++){
    if(closed[i]) continue;
    auto j = i;
    ulong k = 0L;
    while(!closed[j]){
      closed[j] = true;
      j = s[j];
      k++;
    }
    result = result.lcm(k);
  }
  writeln(result % 998244353);
}