#include "bits/stdc++.h"

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> veci;
typedef vector<ll> vecll;
typedef vector<string> vecs;
template<class T,class U> using Hash=unordered_map<T,U>;

#define REP(i, a, n) for(ll i = (a); (i) < (ll)(n); (i)++)
#define RREP(i, a, n) for(ll i = (n)-1; (i) >= (a); (i)--)
#define rep(i, n) REP(i, 0, n)
#define rrep(i, n) RREP(i, 0, n)
#define MOD 1000000007ULL
#define _SPLIT " "

template<class T> T read(){T a;cin >> a;return a;}
template<class T> void read(T& a){cin >> a;}
template<class T,class ...Args> void read(T& a, Args&... args){cin >> a; read(args...);} 
template<class T> void rarr(T& a, int n){for(int i = 0; i < n; i++) {cin >> a[i];}}
template<class T> void write(T a){cout << setprecision(22) << a << endl;}
template<class T,class ...Args> void write(T a, Args... args){cout << setprecision(22) << a << _SPLIT; write(args...);}
template<class T> void warr(vector<T> a, const char* c = " "){cout << a[0];for(int i = 1; i < (int)a.size(); i++)cout << c << a[i];cout << endl;;}
template<class T> void warr(T a, int n, const char* c = " "){cout << a[0];for(int i = 1; i < n; i++)cout << c << a[i];cout << endl;}
void split(string s, string delim, veci& result){result.clear();string::size_type pos = 0;while(pos != string::npos){string::size_type p = s.find(delim, pos);if(p == string::npos){result.push_back(atoi(s.substr(pos).data()));break;}else {result.push_back(atoi(s.substr(pos, p - pos).data()));}pos = p + delim.size();}}
void split(string s, string delim, vecs& result){result.clear();string::size_type pos = 0;while(pos != string::npos){string::size_type p = s.find(delim, pos);if(p == string::npos){result.push_back(s.substr(pos));break;}else {result.push_back(s.substr(pos, p - pos));}pos = p + delim.size();}}
ll gcd(ll a, ll b){while(true){ll k = a % b;if(k == 0)return b;a = b;b = k;}}
ll comb(ll n, ll m){ll p=1;m=min(m,n-m);for(ll i=1;i<=m;i++){p*=n-i+1;p/=i;}return p;}

int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};

int main(void)
{
    int w,h,n;
    read(w,h,n);
    vector<vector<vector<int>>> fd(h);
    rep(i,h)fd[i].resize(w,vector<int>(2));
    rep(i,n){
        int m,b[1010];
        read(m);
        rarr(b,m+1);
        rep(i,m){
            int x1=b[i]%w,y1=b[i]/w;
            int x2=b[i+1]%w,y2=b[i+1]/w;
            y1=h-y1-1,y2=h-y2-1;
            if(y1==y2){
                if(x1>x2)swap(x1,x2);
                fd[y1][x1][0]++,fd[y2][x2][0]--;
            }
            else {
                if(y1>y2)swap(y1,y2);
                fd[y1][x1][1]++,fd[y2][x2][1]--;
            }
        }
    }
    vector<vector<vector<bool>>> fb(h);
    rep(i,h)fb[i].resize(w+1,vector<bool>(4,false));
    rep(i,h){
        int s=0;
        rep(j,w){
            s+=fd[i][j][0];
            if(s>0)fb[i][j][0]=true,fb[i][j+1][2]=true;
        }
    }
    rep(j,w){
        int s=0;
        rep(i,h){
            s+=fd[i][j][1];
            if(s>0)fb[i][j][1]=true,fb[i+1][j][3]=true;
        }
    }
    struct Info{
        Info(int x_,int y_):x(x_),y(y_){}
        int x,y,d;
    };
    //rep(i,h){rep(j,w)cout<<fb[i][j][3];cout<<endl;}
    vector<vector<int>> dist(h);
    const int INF=1e9;
    rep(i,h)dist[i].resize(w,INF);
    queue<Info> q;
    dist[h-1][0]=0;
    q.push(Info(0,h-1));
    while(!q.empty()){
        Info& f=q.front();
        if(f.y==0&&f.x==w-1)break;
        rep(i,4){
            if(!fb[f.y][f.x][i])continue;
            int cx=f.x+dx[i];
            int cy=f.y+dy[i];
            if(dist[cy][cx]<INF-10)continue;
            dist[cy][cx]=dist[f.y][f.x]+1;
            q.push(Info(cx,cy));
        }
        q.pop();
    }
    if(dist[0][w-1]<1e9)write(dist[0][w-1]);
    else write("Odekakedekinai..");
    return 0;
}