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#include <bits/stdc++.h>
using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n; cin >> n; n /= 10;
    string s; cin >> s;
    int r = 0;
    for(int t = 0; t < 10; ++t) {
        bool ok = true;
        for(int i = 0; i < n; ++i)
            if(s[t*n+i] == 'N')
                ok = false;
        if(ok) ++r;
    }
    cout << r << '\n';
}