n, m = map(int, input().split())

ticket = []
for i in range(n):
    s = list(input())
    ticket.append(s)

event = [set() for _ in range(m)]
for i in range(n):
    for j in range(m):
        if ticket[i][j] == "o":
            event[j].add(i)

ans = 0
for i in range(n):
    ok = True
    flag = False
    for j in range(m):
        if ticket[i][j] == "o":
            flag = True
            if len(event[j]) != 1:
                ok = False
                break
    if flag and ok:
        ans += 1

print(ans)