a,b=map(int,input().split())
x=[input() for i in range(a)]
y=[]
def f(i,j,n,r):
    if x[i][j]=="o":
        n+=1
    elif x[i][j]=="x":
        n-=1
    else:
        return 0
    r+=[[i,j,n]]
    if i==a-1 and j==b-1:
        if n>=0:
            y.append("A")
            #print(r)
            r=[]
            return 0
    else:
        if n>=0:
            if i<a-1:
                f(i+1,j,n,r)
            if j<b-1:
                f(i,j+1,n,r)
f(0,0,0,[])
print(len(y))