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#include <iostream>
using namespace std;

void solve(void) {

    int n; cin >> n;
    string s; cin >> s;

    bool u;

    int w = 0;

    for (int i = 0; i <= n - n/10; i += n/10) {

        u = true;

        for (int j = i; j <= i + n / 10 - 1; j++) {

            if (s[j] == 'N') u = false;

        }

        if (u) w++;

    }

    cout << w;

    return;

}

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

    solve();
}