H, W = map(int, input().split())
A = []
for i in range(H):
    A.append(list(map(int, input().split())))
    
from heapq import *
def bfs(sx, sy, H, W):
    dist = [[-1] * W for _ in range(H)]
    dist[sx][sy] = 0
    dx = [1, 0, -1, 0]
    dy = [0, 1, 0, -1]
    HH = [(0, sx, sy)]
    now = 0
    seen = [[0] * W for _ in range(H)]
    seen[sx][sy] = 1
    while HH:
        _, px, py = heappop(HH)
        dist[px][py] = now
        now += 1
        for k in range(4):
            x = px + dx[k]
            y = py + dy[k]
            if x < 0 or x > H - 1 or y < 0 or y > W - 1:
                continue
            if seen[x][y]:
                continue
            seen[x][y] = 1
            heappush(HH, (A[x][y], x, y))
            
    return dist

d1 = bfs(0, 0, H, W)
d2 = bfs(H - 1, W - 1, H, W)

ans = 10 ** 18
dx = [1, 0, -1, 0]
dy = [0, 1, 0, -1]
for i in range(H):
    for j in range(W):
        now = d1[i][j]
        flag = 0
        for k in range(4):
            x = i + dx[k]
            y = j + dy[k]
            if x < 0 or x > H - 1 or y < 0 or y > W - 1:
                continue
            if d2[x][y] < now:
                flag = 1
                break
        if flag:
            ans = min(ans, 2 * now - 1)
            
        now = d2[i][j]
        flag = 0
        for k in range(4):
            x = i + dx[k]
            y = j + dy[k]
            if x < 0 or x > H - 1 or y < 0 or y > W - 1:
                continue
            if d1[x][y] <= now:
                flag = 1
                break
        if flag:
            ans = min(ans, 2 * now)
            
                  
print(ans)