#include <iostream>
#include <queue>
using namespace std;
typedef long long ll;

template <typename T>
struct Edge
{
    int to;
    T cost;
};

template <typename T>
struct WeightedGraph
{
    int n;
    std::vector<std::vector<Edge<T>>> g;
    
    WeightedGraph(){}
    
    WeightedGraph(int n) : n(n){
        g.resize(n);
    }
    
    void add_edge(int from, int to, T cost){
        g[from].push_back((Edge<T>){to, cost});
    }
};

template <typename T>
std::vector<T> dijkstra(WeightedGraph<T> &g, int s){
    int n = g.n;
    std::vector<T> d(n);
    fill(d.begin(), d.end(), -2);
    std::priority_queue<std::pair<T, int>, std::vector<std::pair<T, int>>, std::greater<std::pair<T, int>>> que;
    d[s] = 0;
    que.push(std::pair<T, int>(0, s));
    while(que.size()){
        std::pair<T, int> p = que.top();
        que.pop();
        int u = p.second;
        if(d[u] < p.first) continue;
        for(Edge<T> &e : g.g[u]){
            int v = e.to;
            if(d[v] == -2 || d[v] > d[u] + e.cost){
                d[v] = d[u] + e.cost;
                que.push(std::pair<T, int>(d[v], v));
            }
        }
    }
    return d;
}

int main()
{
    int n, m;
    cin >> n >> m;
    int k[100005];
    ll c[100005];
    vector<int> s[100005];
    int l = 0;
    for(int i = 0; i < m; i++){
        cin >> k[i] >> c[i];
        l += k[i];
        s[i].resize(k[i]);
        for(int j = 0; j < k[i]; j++) cin >> s[i][j];
    }
    WeightedGraph<ll> g(l + m * 2 + 2);
    int id = m * 2;
    for(int i = 0; i < m; i++){
        for(int j = 0; j < k[i]; j++){
            g.add_edge(id, i * 2, (s[i][j] + 1) / 2 * 2 + c[i]);
            g.add_edge(i * 2, id, (s[i][j] + 1) / 2 * 2 + c[i]);
            if(s[i][j] % 2){
                g.add_edge(id, i * 2 + 1, s[i][j] + c[i]);
                g.add_edge(i * 2 + 1, id, s[i][j] + c[i]);
            }
            if(s[i][j] == 1) g.add_edge(l + m * 2, id, 0);
            if(s[i][j] == n) g.add_edge(id, l + m * 2 + 1, 0);
            id++;
        }
    }
    vector<ll> d = dijkstra(g, l + m * 2);
    cout << d[l + m * 2 + 1] / 2 << endl;
}