#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using pint=pair<int,int>;
#define rep(i,n) for(int i=0;i<(n);++i)
template<typename T>
void chmax(T& a,T b){if(a<b){a=b;};}
template<typename T>
void chmin(T& a,T b){if(a>b){a=b;};}
const int inf=1e9;

int main(){
  int n,m;cin>>n>>m;
  vector<int> cnt(m);
  vector<string> s(n);
  rep(i,n){
    cin>>s[i];
    rep(j,m)if(s[i][j]=='o')cnt[j]++;
  }
  int ans=0;
  rep(i,n){
    bool ok=false;
    rep(j,m)if(s[i][j]=='o')ok=true;
    rep(j,m)if(s[i][j]=='o'&&cnt[j]>1)ok=false;
    ans+=ok;
  }
  cout<<ans<<endl;
}