#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(ll i=0;i<n;i++)
#define repl(i,l,r) for(ll i=(l);i<(r);i++)
#define per(i,n) for(ll i=(n)-1;i>=0;i--)
#define perl(i,r,l) for(ll i=r-1;i>=l;i--)
#define fi first
#define se second
#define pb push_back
#define ins insert
#define pqueue(x) priority_queue<x,vector<x>,greater<x>>
#define all(x) (x).begin(),(x).end()
#define CST(x) cout<<fixed<<setprecision(x)
#define vtpl(x,y,z) vector<tuple<x,y,z>>
#define rev(x) reverse(x);
using ll=long long;
using vl=vector<ll>;
using vvl=vector<vector<ll>>;
using pl=pair<ll,ll>;
using vpl=vector<pl>;
using vvpl=vector<vpl>;
const ll MOD=1000000007;
const ll MOD9=998244353;
const int inf=1e9+10;
const ll INF=4e18;
const ll dy[9]={0,1,-1,0,1,1,-1,-1,0};
const ll dx[9]={1,0,0,-1,1,-1,1,-1,0};
template<class T> inline bool chmin(T& a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}
template<class T> inline bool chmax(T& a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
} 

int main(){
    ll h,w;cin >> w >> h;
    vvl g(h*w);
    vector<set<ll>> x(h),y(w);
    rep(i,h){
        rep(j,w-1){
            x[i].insert(j+w*i);
        }
        x[i].insert(INF);
    }
    rep(i,w){
        rep(j,h-1){
            y[i].insert(j*w+i);
        }
        y[i].insert(INF);
    }
    ll n;cin >> n;
    rep(i,n){
        ll m;cin >> m;
        ll left;cin >> left;
        rep(j,m){
            ll right;cin >> right;
            if(left%w==right%w){
                ll lx=min(left,right),rx=max(left,right);
                auto itr=y[left%w].lower_bound(lx);
                for(;;){
                    if(*itr>=rx)break;
                    g[*itr].push_back(*itr+w);
                    g[*itr+w].push_back(*itr);
                    itr=y[left%w].erase(itr);
                }
            }
            else{
                ll lx=min(left,right),rx=max(left,right);
                auto itr=x[left/w].lower_bound(lx);
                for(;;){
                    if(*itr>=rx)break;
                    g[*itr].push_back(*itr+1);
                    g[*itr+1].push_back(*itr);
                    itr=x[left/w].erase(itr);
                }
            }
            left=right;
        }
    }
    vl dist(h*w,-1);dist[0]=0;
    queue<ll> que;que.push(0);
    while(!que.empty()){
        ll v=que.front();que.pop();
        for(auto p:g[v]){
            if(dist[p]!=-1)continue;
            que.push(p);
            dist[p]=dist[v]+1;
        }
    }
    if(dist[h*w-1]==-1)cout << "Odekakedekinai.." << endl;
    else cout << dist[h*w-1] << endl;
}