from collections import deque
h,w=map(int,input().split())
a=[list(input()) for _ in range(h)]
roots=deque([[(0,0,1)]])
count=0
while roots:
	t=roots.popleft()
	x,y,c=t[-1]
	if x==h-1 and y==w-1:
		count+=1
		continue
	if x+1<h and ( a[x+1][y]=="o" or ( a[x+1][y]=="x" and c>0 ) ):
		d= c-1 if a[x+1][y]=="x" else c+1
		g=t.copy()
		g.append((x+1,y,d))
		roots.append(g)
	if y+1<w and ( a[x][y+1]=="o" or ( a[x][y+1]=="x" and c>0 ) ):
		d= c-1 if a[x][y+1]=="x" else c+1
		g=t.copy()
		g.append((x,y+1,d))
		roots.append(g)
print(count)