/* -*- coding: utf-8 -*-
 *
 * 340.cc: No.340 雪の足跡 - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_W = 1000;
const int MAX_H = 1000;

const int dxs[] = {1, 0, -1, 0}, dys[] = {0, 1, 0, -1};

const int INF = 1 << 30;

/* typedef */

typedef vector<int> vi;
typedef queue<int> qi;
typedef pair<int,int> pii;

/* global variables */

int nbrs[MAX_H][MAX_W][4], dists[MAX_H][MAX_W];

/* subroutines */

/* main */

int main() {
  int w, h, n;
  cin >> w >> h >> n;

  while (n--) {
    int m, b0;
    cin >> m >> b0;

    int x0 = b0 % w, y0 = b0 / w;
    while (m--) {
      int b1;
      cin >> b1;
      int x1 = b1 % w, y1 = b1 / w;
      //printf("(%d,%d)->(%d,%d)\n", x0, y0, x1, y1);

      if (x0 < x1)
	nbrs[y0][x0][0]++, nbrs[y0][x1][0]--;
      else if (y0 < y1)
	nbrs[y0][x0][1]++, nbrs[y1][x0][1]--;
      else if (x0 > x1)
	nbrs[y0][x1][0]++, nbrs[y0][x0][0]--;
      else 
	nbrs[y1][x0][1]++, nbrs[y0][x0][1]--;

      x0 = x1, y0 = y1;
    }
  }

  for (int y = 0; y < h; y++)
    for (int x = 1; x < w; x++) nbrs[y][x][0] += nbrs[y][x - 1][0];
  for (int x = 0; x < w; x++)
    for (int y = 1; y < h; y++) nbrs[y][x][1] += nbrs[y - 1][x][1];
  for (int y = 0; y < h; y++)
    for (int x = 0; x < w; x++) {
      if (nbrs[y][x][0]) nbrs[y][x + 1][2] = true;
      if (nbrs[y][x][1]) nbrs[y + 1][x][3] = true;
    }
      
  for (int y = 0; y < h; y++)
    for (int x = 0; x < w; x++) dists[y][x] = INF;
  dists[0][0] = 0;

  queue<pii> q;
  q.push(pii(0, 0));

  while (! q.empty()) {
    pii u = q.front(); q.pop();
    int ux = u.first, uy = u.second;
    //printf("x=%d,y=%d,d=%d\n", ux, uy, dists[uy][ux]);

    if (ux == w - 1 && uy == h - 1) break;

    int vd = dists[uy][ux] + 1;

    for (int di = 0; di < 4; di++)
      if (nbrs[uy][ux][di]) {
	int vx = ux + dxs[di], vy = uy + dys[di];
	//printf("  (%d,%d)[%d]->(%d,%d):%d\n", ux, uy, di, vx, vy, dists[vy][vx]);
	if (dists[vy][vx] > vd) {
	  dists[vy][vx] = vd;
	  q.push(pii(vx, vy));
	}
      }
  }

  int gd = dists[h - 1][w - 1];
  if (gd >= INF)
    puts("Odekakedekinai..");
  else
    printf("%d\n", gd);

  return 0;
}