'''input'''
i1=lambda:int(s1())
i2=lambda:map(int,s2())
il=lambda:list(i2())
s1=lambda:input()
s2=lambda:s1().split()
sl=lambda:list(s2())
'''output'''
yn=lambda b:print("Yes" if b else "No")
'''createList'''
cl=lambda x,d:[d for i in range(x)]# a=c2l(10,23,"x")
'''code'''
from functools import cache
H,W=i2()
ma=[["#" for i in range(W+1)]for j in range(H+1)]
for i in range(H):
    s=s1()
    for j in range(W):
        ma[i][j]=s[j]
@cache
def b(i,j,num):
    u=num
    if i==H-1 and j==W-1:
        if num!=1 or ma[i][j]!="x":
            return 1
        return 0
    if ma[i][j]=="x":
        u-=1
        if u==0:
            return 0
    if ma[i][j]=="o":
        u+=1
    if ma[i][j]=="#":
        return 0
    return b(i+1,j,u)+b(i,j+1,u)
print(b(0,0,1))