#include <bits/stdc++.h>
using namespace std;
int M = 1000000007;
#define LM 1000000
bool l[LM][4];
int dist[LM];
int th[LM][2];
int main(){
    int w, h, n;
    scanf("%d%d%d", &w, &h, &n);
    for (int i = 0; i < LM; ++i)
        dist[i] = M;
    for (int i = 0; i < n; ++i){
        int m, b[1001];
        scanf("%d", &m);
        for (int j = 0; j < m + 1; ++j){
            scanf("%d", &b[j]);
            if (!j) continue;

            int sm = b[j] > b[j - 1] ? b[j - 1] : b[j];
            int la = b[j] > b[j - 1] ? b[j] : b[j - 1];
            if (la - sm >= w){
                ++th[sm][0];
                --th[la][0];
            }
            else{
                ++th[sm][1];
                --th[la][1];
            }
        }
    }
    for (int i = 0; i < w; ++i){
        int sum = 0;
        for (int j = i; j < w * h; j += w){
            sum += th[j][0];
            if (sum > 0){
                l[j][0] = true;
                l[j + w][2] = true;
            }
        }
    }
    for (int i = 0; i < w * h; i += w){
        int sum = 0;
        for (int j = i; j < w + i; ++j){
            sum += th[j][1];
            if (sum > 0){
                l[j][1] = true;
                l[j + 1][3] = true;
            }
        }
    }
    queue<int> q;
    dist[0] = 0;
    q.push(0);
    while (!q.empty()){
        int p = q.front();
        q.pop();
        if (p == w * h - 1) break;

        int pd = dist[p] + 1;
        if (l[p][0] && dist[p + w] > pd){
            dist[p + w] = pd;
            q.push(p + w);
        }
        if (l[p][1] && dist[p + 1] > pd){
            dist[p + 1] = pd;
            q.push(p + 1);
        }
        if (l[p][2] && dist[p - w] > pd){
            dist[p - w] = pd;
            q.push(p - w);
        }
        if (l[p][3] && dist[p - 1] > pd){
            dist[p - 1] = pd;
            q.push(p - 1);
        }
    }
    if (dist[w * h - 1] >= M)
        printf("Odekakedekinai..\n");
    else
        printf("%d\n", dist[w * h - 1]);
}