N, M = map(int, input().split())

S = [input() for _ in range(N)]
cnt = [0] * M
for i in range(N):
    for j in range(M):
        if S[i][j] == "o":
            cnt[j] += 1

ans = 0
for i in range(N):
    tmp = 1
    for j in range(M):
        if S[i][j] == "o" and cnt[j] != 1:
            tmp = 0
    if S[i] == "x" * M:
        tmp = 0
    ans += tmp

print(ans)