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

R = [0 for _ in range(M)]
T = [[] for _ in range(N)]
for i in range(N):
    for j in range(M):
        if S[i][j] == 'o':
            R[j] += 1
            T[i].append(j)
            
ANS = []


for t in T:
    F1, F2 = False, True
    for b in t:
        if R[b]== 1:
            F1 = True
        elif R[b] > 1:
            F2 = False
    
    if F1 and F2:
        ANS.append(j)

print(len(ANS))                  
# print(R)
# print(T)