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#include <bits/stdc++.h>
#define dbg(x) " [" << #x << ", " << (x) << "] "
using namespace std;
template<typename T>
ostream& operator<<(ostream& o, const vector<T>& v) {
    o << "{";
    for(auto it = v.begin(); it != v.end(); it++) {
        if(it != v.begin()) o << ", ";
        o << *it;
    }
    return o << "}";
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    int ans = 0;
    for(int i = 0; i < 10; i++) {
        bool ok = true;
        for(int j = 0; j < n / 10; j++) {
            char c;
            cin >> c;
            if(c == 'N') ok = false;
        }
        ans += ok;
    }
    cout << ans << endl;
    return 0;
}