import sys
input = sys.stdin.readline

from collections import deque

W,H,N=map(int,input().split())

UP=[[0]*W for i in range(H)]
RIGHT=[[0]*W for i in range(H)]

for i in range(N):
    M=int(input())
    L=list(map(int,input().split()))

    for j in range(len(L)-1):
        x=L[j]
        a,b=x//W,x%W

        y=L[j+1]
        c,d=y//W,y%W

        if a==c:
            if b>d:
                b,d=d,b

            RIGHT[a][b]+=1
            RIGHT[a][d]-=1

        else:
            if a>c:
                a,c=c,a

            UP[a][b]+=1
            UP[c][b]-=1

for i in range(H):
    for j in range(W):

        if i>0:
            UP[i][j]+=UP[i-1][j]

        if j>0:
            RIGHT[i][j]+=RIGHT[i][j-1]

D=[[1<<60]*W for i in range(H)]
D[0][0]=0
Q=[(0,0)]

Q=deque(Q)

while Q:
    x,y=Q.popleft()

    if RIGHT[x][y]>0:
        if D[x][y+1]>D[x][y]+1:
            D[x][y+1]=D[x][y]+1
            Q.append((x,y+1))

    if y-1>=0 and RIGHT[x][y-1]>0:
        if D[x][y-1]>D[x][y]+1:
            D[x][y-1]=D[x][y]+1
            Q.append((x,y-1))

    if UP[x][y]>0:
        if D[x+1][y]>D[x][y]+1:
            D[x+1][y]=D[x][y]+1
            Q.append((x+1,y))

    if x-1>=0 and RIGHT[x-1][y]>0:
        if D[x-1][y]>D[x][y]+1:
            D[x-1][y]=D[x][y]+1
            Q.append((x-1,y))

ANS=D[H-1][W-1]

if ANS>10**9:
    print("Odekakedekinai..")
else:
    print(ANS)