import sys
readline=sys.stdin.buffer.readline
w, h, n=map(int, readline().split())
s1=[[0]*w for i in range(h)]
s2=[[0]*h for i in range(w)]
for i in range(n):
    m=int(readline())
    b=list(map(int, readline().split()))
    for j in range(m):
        x1, y1=divmod(b[j], w)
        x2, y2=divmod(b[j+1], w)
        if x1==x2:
            if y1>y2:y1, y2=y2, y1
            s1[x1][y1]+=1
            s1[x1][y2]-=1
        else:
            if x1>x2:x1, x2=x2, x1
            s2[y1][x1]+=1
            s2[y1][x2]-=1
from itertools import accumulate
for i in range(h):s1[i]=list(accumulate(s1[i]))
for i in range(w):s2[i]=list(accumulate(s2[i]))
INF=10**9
d=[INF]*(h*w)
d[0]=0
from collections import deque
que=deque([0])
while que:
    p=que.popleft()
    x, y=divmod(p, w)
    d0=d[p]
    p1, p2, p3, p4=(x-1)*w+y, (x+1)*w+y, x*w+y-1, x*w+y+1
    if x-1>=0 and s2[y][x-1]>0 and d[p1]>d0+1:
        d[p1]=d0+1
        que.append(p1)
    if x+1<h and s2[y][x]>0 and d[p2]>d0+1:
        d[p2]=d0+1
        que.append(p2)
    if y-1>=0 and s1[x][y-1]>0 and d[p3]>d0+1:
        d[p3]=d0+1
        que.append(p3)
    if y+1<w and s1[x][y]>0 and d[p4]>d0+1:
        d[p4]=d0+1
        que.append(p4)
print(d[-1] if d[-1]<INF else "Odekakedekinai..")