from collections import Counter
n, m = map(int, input().split())
s = [input() for _ in range(n)]
f = [0] * m
for si in s:
    for j, c in enumerate(si):
        if c == 'o':
            f[j] += 1
ans = 0
for si in s:
    ans += all(c == 'x' or f[j] == 1 for j, c in enumerate(si)) and si.count('o') >= 1
print(ans)