#include <iostream>
#include <vector>
#include <cstdio>
#include <sstream>
#include <map>
#include <string>
#include <algorithm>
#include <queue>
#include <cmath>
#include <functional>
#include <set>
#include <ctime>
#include <random>
using namespace std;
template<class T> istream& operator >> (istream& is, vector<T>& vec){for(T& val: vec) is >> val; return is;}
template<class T> istream& operator , (istream& is, T& val){ return is >> val;}
template<class T> ostream& operator << (ostream& os, vector<T>& vec){for(int i=0; i<vec.size(); i++) os << vec[i] << (i==vec.size()-1?"\n":" ");return os;}
template<class T> ostream& operator , (ostream& os, T& val){ return os << " " << val;}
template<class T> ostream& operator >> (ostream& os, T& val){ return os << " " << val;}

#include <bitset>
using bits = bitset<2047>;

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

	vector<vector<int>> tate(2*h+1, vector<int>(w+1, 0));
	vector<vector<int>> yoko(h+1, vector<int>(2*w+1, 0));

	for(int i=0; i<n; i++){
		int m;
		scanf("%d", &m);
		int pos;
		scanf("%d", &pos);
		while(m--){
			int next;
			scanf("%d", &next);
			if(next%w == pos%w){ // tate
				int c = next%w;
				tate[2*min(pos/w, next/w)][c]++;
				tate[2*max(pos/w, next/w)+1][c]--;
			}else{ // yoko
				int r = next/w;
				yoko[r][2*min(pos%w, next%w)]++;
				yoko[r][2*max(pos%w, next%w)+1]--;
			}
			pos = next;
		}
	}

	vector<bits> ver(w);
	vector<bits> hol(h);

	for(int i=0; i<h; i++){
		int val = 0;
		for(int j=0; j<yoko[i].size(); j++){
			val += yoko[i][j];
			if(val>0) hol[i].set(j);
		}
	}
	for(int j=0; j<w; j++){
		int val = 0;
		for(int i=0; i<tate.size(); i++){
			val += tate[i][j];
			if(val>0) ver[j].set(i);
		}
	}

	vector<vector<int>> dist(h+1, vector<int>(w+1, 10000000));

	dist[0][0] = 0;

	vector<int> dx = {0,0,1,-1};
	vector<int> dy = {1,-1,0,0};

	queue<pair<int,int>> q;

	q.push({0,0});

	while(q.size()){
		auto pos = q.front();
		q.pop();

		int x = pos.second;
		int y = pos.first;
		for(int k__=0; k__<4; k__++){
			int new_x = x + dx[k__];
			int new_y = y + dy[k__];

			if(new_x < 0 || new_x >= w || new_y < 0 || new_y >= h) continue;

			if((x==new_x) ? ver[x][y+new_y] : hol[y][x+new_x]){
				if(dist[new_y][new_x] > dist[y][x] + 1){
					dist[new_y][new_x] = dist[y][x]+1;

					q.push({new_y, new_x});
				}

			}
		}
	}

	if(dist[h-1][w-1] != 10000000){
		cout << dist[h-1][w-1] << endl;
	}else{
		cout << "Odekakedekinai.." << endl;
	}

	return 0;
}