from sys import stdin
from Queue import deque
def main():
    dxy = ((1,0),(0,1),(-1,0),(0,-1))
    W,H,N = map(int,stdin.readline().split())
    MD = W*H+1
    EX = [[0]*(W+2) for j in xrange(H)]
    EY = [[0]*(H+2) for i in xrange(W)]
    for i in xrange(N):
        M = int(stdin.readline())
        B = map(int,stdin.readline().split())
        x = B[0]%W; y = B[0]/W;
        for j in xrange(1,M+1):
            nx = B[j]%W; ny = B[j]/W
            if y == ny:
                if x < nx: 
                    for k in xrange(x+1,nx+1): EX[y][k]+=1
                else:
                    for k in xrange(nx+1,x+1): EX[y][k]+=1
            else:
                if y < ny:
                    for k in xrange(y+1,ny+1): EY[x][k]+=1
                else:
                    for k in xrange(ny+1,y+1): EY[x][k]+=1
            x = nx; y = ny
    D = [[MD]*W for i in xrange(H)]
    D[0][0] = 0; G = W+H-2
    Q = deque([(0,0,0)])
    while Q:
        x,y,d = Q.popleft()
        if x+y == G:
            print d; break
        for dx,dy in dxy:
            if dx > 0:
                nx = x + 1
                if EX[y][nx]>0 and D[y][nx] > d+1:
                    D[y][nx] = d+1; Q.append((nx,y,d+1))
            elif dx < 0:
                nx = x - 1
                if EX[y][x]>0 and D[y][nx] > d+1:
                    D[y][nx] = d+1; Q.append((nx,y,d+1))
            elif dy > 0:
                ny = y + 1
                if EY[x][ny]>0 and D[ny][x] > d+1:
                    D[ny][x] = d+1; Q.append((x,ny,d+1))
            else:
                ny = y - 1
                if EY[x][y]>0 and D[ny][x] > d+1:
                    D[ny][x] = d+1; Q.append((x,ny,d+1))
    else:
        print "Odekakedekinai.."
        
if __name__ == "__main__":
    main()