Untitled

dx = [-1,1,0,0]
dy = [0,0,-1,1]
res = 0

for i in range(len(grid)):
    for j in range(len(grid[i])):
        e = 0
        if grid[i][j] == 1:
            for k in range(4):
                if is_valid(i+dx[k], j+dy[k]) and grid[i+dx[k]][j+dy[k]] == 1:
                    e += 1
            res += 4-e
return res