N,M=map(int,input().split())
S=[input() for i 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):
    ok='o' in S[i]
    for j in range(M):
        if S[i][j]=='o':
            if cnt[j]!=1:
                ok=False
    ans+=ok
print(ans)