import numpy as np

n, m = map(int,input().split())
s = [list(input()) for _ in range(n)]

tmp = [False]*m
st = np.array(s).T.tolist()

for i in range(m):
    tmp2 = 0
    for j in range(n):
        if st[i][j] == "o":
            tmp2 += 1
    if tmp2 == 1:
        tmp[i] = True

ans = 0
for i in range(n):
    ok = False
    for j in range(m):
        if s[i][j] == "o":
            if tmp[j]:
                ok = True
            else:
                ok = False
                break
    if ok:
        ans += 1

print(ans)