#include <bits/stdc++.h>
using namespace std;
using lint = long long int;
using P = pair<int, int>;
using PL = pair<lint, lint>;
#define FOR(i, begin, end) for(int i=(begin),i##_end_=(end);i<i##_end_;i++)
#define IFOR(i, begin, end) for(int i=(end)-1,i##_begin_=(begin);i>=i##_begin_;i--)
#define REP(i, n) FOR(i,0,n)
#define IREP(i, n) IFOR(i,0,n)
#define ALL(a)  (a).begin(),(a).end()
constexpr int MOD = 1000000007;
constexpr lint B1 = 1532834020;
constexpr lint M1 = 2147482409;
constexpr lint B2 = 1388622299;
constexpr lint M2 = 2147478017;
constexpr int INF = 2147483647;
void yes(bool expr) {cout << (expr ? "YES" : "NO") << "\n";}
template<class T>void chmax(T &a, const T &b) { if (a<b) a=b; }
template<class T>void chmin(T &a, const T &b) { if (b<a) a=b; }
int main()
{
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  lint N, M;
  cin >> N >> M;
  vector<lint> c(M);
  vector<vector<int>> s(M);
  vector<vector<int>> itg(N);
  REP(i, M) {
    lint k;
    cin >> k >> c[i];
    REP(j, k) {
      int ss;
      cin >> ss;
      ss--;
      s[i].push_back(ss);
      itg[ss].push_back(i);
    }
  }
  vector<lint> dp(N, 1e15);
  dp[0] = 0;
  multiset<PL> st;
  st.insert(PL(0, 0));
  vector<bool> used(M);
  while(!st.empty()) {
    PL pl = *st.begin();
    st.erase(pl);
    lint d = pl.first;
    int idx = pl.second;
    if(idx == N-1) {
      cout << d << endl;
      return 0;
    }
    for(int x : itg[idx]) {
      if(!used[x]) {
        used[x] = true;
        for(int y : s[x]) {
          lint tmp = (lint)(idx + y + 1) / 2 + 1 + c[x] + d;
          if(tmp < dp[y]) {
            dp[y] = tmp;
            st.insert(PL(tmp, y));
          }
        }
      }
    }
  }
  cout << -1 << endl;
}