#include<bits/stdc++.h>
using namespace std; 
#define int long long
#define rep(i,n) for(int i=0; i<n; i++)

signed main() {
    int n, m;
    cin>>n>>m;
    vector<bitset<100>> p(n), other(n);
    bitset<100> mask, exist;
    rep(i, m) mask[i]=1;
    rep(i, n) {
        string s; cin>>s;
        rep(j, m) p[i][j]=s[j]=='o';
    }
    rep(i, n) {
        exist|=p[i];
        rep(j, n) {
            if(i==j) continue;
            other[i]|=p[j];
        }
    }
    int res=0;
    rep(i, n) {
        if(p[i].count()&&p[i]==(~other[i]&exist&mask)) res++;
    }
    cout<<res<<endl;
}