import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		int w = sc.nextInt();
		int h = sc.nextInt();
		int n = sc.nextInt();
		int size = w * h;
		int[][] hfield = new int[h][w];
		int[][] vfield = new int[w][h];
		for (int i = 0; i < n; i++) {
		    int count = sc.nextInt();
		    int prev = sc.nextInt();
		    for (int j = 0; j < count; j++) {
		        int current = sc.nextInt();
		        int left = Math.min(prev, current);
		        int right = Math.max(prev, current);
		        if (right - left < w) {
		            int height = left / w;
		            hfield[height][left % w]++;
		            hfield[height][right % w]--;
		        } else {
		            int width = left % w;
		            vfield[width][left / w]++;
		            vfield[width][right / w]--;
		        }
		        prev = current;
		    }
		}
		for (int i = 0; i < h; i++) {
		    for (int j = 1; j < w; j++) {
		        hfield[i][j] += hfield[i][j - 1];
		    }
		}
		for (int i = 0; i < w; i++) {
		    for (int j = 1; j < h; j++) {
		        vfield[i][j] += vfield[i][j - 1];
		    }
		}
		int[][] costs = new int[h][w];
		for (int i = 0; i < h; i++) {
		    Arrays.fill(costs[i], Integer.MAX_VALUE);
		}
		PriorityQueue<Path> queue = new PriorityQueue<>();
		queue.add(new Path(0, 0, 0));
		while (queue.size() > 0) {
		    Path p = queue.poll();
		    if (costs[p.height][p.width] <= p.value) {
		        continue;
		    }
		    costs[p.height][p.width] = p.value;
		    if (p.height > 0 && vfield[p.width][p.height - 1] > 0) {
		        queue.add(new Path(p.height - 1, p.width, p.value + 1));
		    }
		    if (p.height < h - 1 && vfield[p.width][p.height] > 0) {
		        queue.add(new Path(p.height + 1, p.width, p.value + 1));
		    }
		    if (p.width > 0 && hfield[p.height][p.width - 1] > 0) {
		        queue.add(new Path(p.height, p.width - 1, p.value + 1));
		    }
		    if (p.width < w - 1 && hfield[p.height][p.width] > 0) {
		        queue.add(new Path(p.height, p.width + 1, p.value + 1));
		    }
		}
		if (costs[h - 1][w - 1] == Integer.MAX_VALUE) {
		    System.out.println("Odekakedekinai..");
		} else {
		    System.out.println(costs[h - 1][w - 1]);
		}
	}
	
	static class Path implements Comparable<Path> {
	    int height;
	    int width;
	    int value;
	    
	    public Path(int height, int width, int value) {
	        this.height = height;
	        this.width = width;
	        this.value = value;
	    }
	    
	    public int compareTo(Path another) {
	        return value - another.value;
	    }
	}
}