N, M = map(int, input().split())
S = [input() for i in range(N)]

v = [[i for i in range(N) if S[i][j] == 'o'] for j in range(M)]
B = [any(S[i][j] == 'o' for j in range(M)) for i in range(N)]
for j in range(M):
	if len(v[j]) != 1:
		for i in v[j]:
			B[i] = False
print(sum(B))