#include <iostream>
#include <vector>
#include <map>
#include <algorithm>
#include <limits.h>
#include <time.h>
#include <string>
#include <string.h>
#include <sstream>
#include <set>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <stack>
#include <queue>

using namespace std;

typedef long long ll;

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

const int DY[4] = {-1, 0, 0, 1};
const int DX[4] = { 0,-1, 1, 0};

struct Coord {
  int y;
  int x;
  int dist;

  Coord(int y, int x, int dist){
    this->y = y;
    this->x = x;
    this->dist = dist;
  }
};

short field[MAX_H][MAX_W][2];
bool walking[MAX_H][MAX_W][4];

int w, h, n;

void walk(int from, int to){
  int fromY = from/w;
  int fromX = from%w;
  int toY = to/w;
  int toX = to%w;

  if(fromY < toY){
    field[fromY][fromX][0]++;
    field[toY][toX][0]--;
  }else if(fromX < toX){
    field[fromY][fromX][1]++;
    field[toY][toX][1]--;
  }else if(fromY > toY){
    field[fromY][fromX][0]--;
    field[toY][toX][0]++;
  }else{
    field[fromY][fromX][1]--;
    field[toY][toX][1]++;
  }
}

void cleanField(){
  int valuesW[w];
  int valuesH[h];
  memset(valuesW, 0, sizeof(valuesW));
  memset(valuesH, 0, sizeof(valuesH));

  for(int y = 0; y < h; y++){
    for(int x = 0; x < w; x++){
      if(y > 0 && valuesW[x] > 0){
        walking[y-1][x][3] = true;
        walking[y][x][0] = true;
      }
      if(x > 0 && valuesH[y] > 0){
        walking[y][x-1][2] = true;
        walking[y][x][1] = true;
      }

      valuesW[x] += field[y][x][0];
      valuesH[y] += field[y][x][1];
    }
  }
}

int main(){
  memset(field, 0, sizeof(field));
  memset(walking, false, sizeof(walking));

  cin >> w >> h >> n;

  for(int i = 0; i < n; i++){
    int m;
    scanf("%d", &m);

    int bp = 0;
    int p = 0;

    for(int j = 0; j < m+1; j++){
      bp = p;
      scanf("%d", &p);

      if(j > 0){
        walk(bp, p);
      }
    }
  }

  cleanField();

  queue<Coord> que;
  que.push(Coord(0, 0, 0));

  int minDist = INT_MAX;

  map<int, bool> checkList;

  while(!que.empty()){
    Coord coord = que.front(); que.pop();
    int z = coord.y * w + coord.x;

    if(checkList[z]) continue;
    checkList[z] = true;

    if(h*w-1 == z){
      minDist = min(minDist, coord.dist);
      continue;
    }

    for(int i = 0; i < 4; i++){
      int ny = coord.y + DY[i];
      int nx = coord.x + DX[i];

      if(ny < 0 || h <= ny || nx < 0 || w <= nx) continue;
      if(walking[coord.y][coord.x][i]){
        que.push(Coord(ny, nx, coord.dist+1));
      }
    }
  }

  if (minDist == INT_MAX){
    cout << "Odekakedekinai.." << endl;
  }else{
    cout << minDist << endl;
  }

  return 0;
}