import sys
from collections import deque

readline = sys.stdin.readline
input_value = readline().split()
H = int(input_value[0])
W = int(input_value[1])

grid = [None] * H
for h in range(H):
    fragment_grid = readline().split()
    grid.append(fragment_grid)

dist = [[-1] * W for _ in range(H)]
queue = deque()
dist[0][0] = 0
queue.append((0,0))

dy = [-1, 1, 0, 0]
dx = [0, 0, -1, 1]
ans = H + W

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

    if y == H - 1 and x == W - 1:
        ans = dist[y][x]
        break
    
    for i in range(4):
        ny = y + dy[i]
        nx = x + dx[i]

        if 0 <= ny < H and 0 <= nx < W:
            if grid[ny][nx] == '.' and dist[ny][nx] == -1:
                dist[ny][nx] = dist[y][x] + 1
                queue.append((ny, nx))

print(ans)