#include <bits/stdc++.h>

using namespace std;
typedef long long int ll;
typedef pair<int, int> P;
typedef pair<ll, ll> Pll;
typedef vector<int> Vi;
//typedef tuple<int, int, int> T;
#define FOR(i,s,x) for(int i=s;i<(int)(x);i++)
#define REP(i,x) FOR(i,0,x)
#define ALL(c) c.begin(), c.end()
#define DUMP( x ) cerr << #x << " = " << ( x ) << endl

const int dr[4] = {-1, 0, 1, 0};
const int dc[4] = {0, 1, 0, -1};

#define INF 1000010

int dist[1000010];
int imos_w[1000010], imos_h[1000010];
vector<int> E[1000010];
int V;

struct Node {
  int v, dist;
  Node(int v, int dist) :
    v(v), dist(dist) { };
  bool operator < (const Node &n) const {
    return dist > n.dist; // reverse
  }
};

struct ShortestPath {
  int start;

  ShortestPath(int start) : start(start) { }

  inline void dijkstra(int goal) {
    queue<Node> que;
    dist[start] = 0;
    que.push(Node(start, 0));

    while (!que.empty()) {
      Node n = que.front(); que.pop();
      int v = n.v, cost = n.dist;
      if (dist[v] < cost) continue;
      cost++;
      REP(i, E[v].size()) {
	int nv = E[v][i];
	if (nv and not dist[nv]) {
	  dist[nv] = cost;
	  if (nv == goal) return ;
	  que.push(Node(nv, cost));
	}
      }
    }
  }
};

int main() {
  int W, H, N;
  scanf("%d%d%d", &W, &H, &N);
  V = W * H;

  REP(i, N) {
    int M, prev; scanf("%d%d", &M, &prev);
    REP(i, M) {
      int b; scanf("%d", &b);
      int p1 = prev, p2 = b; if (p1 > p2) swap(p1, p2);
      int r1 = p1 / W, c1 = p1 % W, r2 = p2 / W, c2 = p2 % W;
      //cout << '(' << r1 << ',' << c1 << ')' << ' ' << '(' << r2 << ',' << c2 << ')' << endl;
      if (r1 == r2) {
	imos_w[p1]++, imos_w[p2]--;
      } else if (c1 == c2) {
	imos_h[c1 * H + r1]++, imos_h[c2 * H + r2]--;
      }
      prev = b;
    }
  }
  REP(i, V-1) imos_h[i+1] += imos_h[i], imos_w[i+1] += imos_w[i];

  REP(i, V-1) {
    if (imos_w[i]) E[i].push_back(i+1), E[i+1].push_back(i);
    if (imos_h[i]) {
      int p1 = (i%H)*W+i/H, p2 = p1 + W;
      E[p1].push_back(p2), E[p2].push_back(p1);
    }
  }
  /*REP(i, W*H) {
    cout << i << ':';
    for (auto v : g.E[i]) cout << v.dst << ' ';
    cout << endl;
    }*/

  ShortestPath sp(0);
  sp.dijkstra(V-1);
  if (V-1 and dist[V-1] == 0) {
    printf("Odekakedekinai..\n");
  } else {
    printf("%d\n", dist[V-1]);
  }
  //REP(i, V) cout << sp.dist[i] << (i == V-1 ? '\n' : ' ');
  return 0;
}