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#include <bits/stdc++.h>

using namespace std;

int solve() {
    int n, r = 0;
    string s;
    cin >> n >> s;
    for (int i = 0; i < n; i += n / 10) {
        bool t = true;
        for (int j = 0; t && j < n / 10; ++j)
            t = (s[i + j] == 'T');

        r += t;
    }

    return r;
}

int main() {
    ios_base::sync_with_stdio(false), cin.tie(nullptr);
    cout << solve() << '\n';
    return 0;
}