H,W=list(map(int,input().split()))
A=[input() for _ in range(H)]

ans=0
for i in range(1<<(H+W-2)):
    n=i.bit_count()
    bit=i
    row=0
    col=0
    cnt=1
    ok=True
    for j in range(H+W-2):
        if (bit>>j)&1==0:
            if row+1>=H or A[row+1][col]=="#":
                ok=False
                break
            if A[row+1][col]=="x":
                if cnt==0:
                    ok=False
                    break
                cnt-=1
            if A[row+1][col]=="o":
                cnt+=1
            row+=1
        else:
            if col+1>=W or A[row][col+1]=="#":
                ok=False
                break
            if A[row][col+1]=="x":
                if cnt==0:
                    ok=False
                    break
                cnt-=1
            if A[row][col+1]=="o":
                cnt+=1
            col+=1
        # print(bin(bit),row,col,cnt)
    if ok and row==H-1 and col==W-1:ans+=1
print(ans)