#include <bits/stdc++.h>

#define REP(i,n) for(int i=0;i<(int)(n);i++)
#define ALL(x) (x).begin(),(x).end()

using namespace std;

const int INF = 1e9;

int row[1024][1024], column[1024][1024];
vector<int> g[1024000];

int main() {
  int W, H, N;
  cin >> W >> H >> N;
  REP(i,N) {
    int M; cin >> M;
    vector<int> B(M+1);
    REP(j,M+1) cin >> B[j];
    REP(j,M) {
      int a = B[j], b = B[j+1];
      if (a > b) swap(a, b);
      if (b - a < W) { ++row[a/W][a%W]; --row[b/W][b%W]; }
      else { ++column[a/W][a%W]; --column[b/W][b%W]; }
    }
  }
  REP(i,H) REP(j,W-1) row[i][j+1] += row[i][j];
  REP(i,H-1) REP(j,W) column[i+1][j] += column[i][j];
  REP(i,H) REP(j,W) {
    if (row[i][j]) {
      g[i*W+j].push_back(i*W+j+1);
      g[i*W+j+1].push_back(i*W+j);
    }
    if (column[i][j]) {
      g[i*W+j].push_back(i*W+j+W);
      g[i*W+j+W].push_back(i*W+j);
    }
  }
  vector<int> dist(H * W, INF);
  dist[0] = 0;
  queue<int> que;
  que.push(0);
  while (!que.empty()) {
    int v = que.front();
    que.pop();
    for (int i: g[v]) {
      if (dist[i] < INF) continue;
      dist[i] = dist[v] + 1;
      que.push(i);
    }
  }
  //for (int i: dist) cout << i << endl;
  if (dist[H * W - 1] == INF) cout << "Odekakedekinai.." << endl;
  else cout << dist[H * W - 1] << endl;
  return 0;
}