N, M = [int(s) for s in input().split()]
S = [[*input()] for _ in range(N)]

ans = 0

for i in range(N):
    if all(s == "x" for s in S[i]):
        continue

    is_valid = True

    for j in range(N):
        if i == j:
            continue
        for k in range(M):
            if S[i][k] == S[j][k] == "o":
                is_valid = False

    ans += is_valid

print(ans)