import java.io.PrintWriter;
import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.Queue;
import java.util.Scanner;

public class Main {
	
	void run() {
		Scanner sc=new Scanner(System.in);
		PrintWriter pw=new PrintWriter(System.out);
		int H=sc.nextInt();
		int W=sc.nextInt();
		int N=sc.nextInt();
		int[][][] horizontal=new int[2][H+1][W+1];
		int[][][] vertical=new int[2][H+1][W+1];
		for (int i=0;i<N;++i) {
			int M=sc.nextInt();
			int[] B=new int[M+1];
			for (int j=0;j<M+1;++j) {
				B[j]=Integer.parseInt(sc.next()); // w+hW
			}
			for (int j=0;j<M;++j) {
				int src=B[j];
				int dst=B[j+1];
				int hs=src/W;
				int ws=src%W;
				int hd=dst/W;
				int wd=dst%W;
				if (hs==hd) {
					if (ws<wd) { 
						++horizontal[1][hs][ws];
						--horizontal[1][hd][wd];
					} else {
						--horizontal[0][hs][ws+1];
						++horizontal[0][hd][wd+1];
					}
				} else {
					if (hs<hd) {
						++vertical[1][hs][ws];
						--vertical[1][hd][wd];
					} else {
						--vertical[0][hs+1][ws];
						++vertical[0][hd+1][wd];
					}
				}
			}
		}
		for (int k=0;k<2;++k) {
			for (int i=0;i<=H;++i) {
				for (int j=0;j<=W;++j) {
					if (j+1<=W) horizontal[k][i][j+1]+=horizontal[k][i][j];
					if (i+1<=H) vertical[k][i+1][j]+=vertical[k][i][j];
				}
			}
		}
		int[][] dist=new int[H][W];
		int INF=Integer.MAX_VALUE/3;
		for (int i=0;i<H;++i) for (int j=0;j<W;++j) dist[i][j]=INF;
		dist[0][0]=0;
		Queue<Integer> que=new ArrayDeque<Integer>();
		que.add(0);
		while (!que.isEmpty()) {
			int p=que.poll();
			int h=p/W;
			int w=p%W;
			if (dist[h][w]==INF) continue;
			int[] dh= {-1,1,0,0};
			int[] dw= {0,0,-1,1};
			for (int k=0;k<4;++k) {
				int nh=h+dh[k];
				int nw=w+dw[k];
				if (nh<0||nw<0||nh>=H||nw>=W) continue;
				if (dist[nh][nw]<=dist[h][w]+1) continue;
				if ((dw[k]!=0&&(horizontal[(dw[k]+1)/2][h][w]>0||horizontal[((dw[k]+1)/2)^1][h][w+dw[k]]>0))||(dh[k]!=0&&(vertical[(dh[k]+1)/2][h][w]>0||vertical[((dh[k]+1)/2)^1][h+dh[k]][w]>0))) {
					dist[nh][nw]=dist[h][w]+1;
					que.add(nw+nh*W);
				}
			}
		}
		pw.println(dist[H-1][W-1]==INF?"Odekakedekinai..":dist[H-1][W-1]);
		pw.close();
	}
	
	void tr(Object...objects) {System.out.println(Arrays.deepToString(objects));}
	
    public static void main(String[] args) {
    	new Main().run();
    }
}