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

int main() {
    ios_base::sync_with_stdio(false); cin.tie(0);
    int n; cin >> n; int k = n/10, wynik = 0;
    string a; cin >> a;
    for (int i = 0; i < a.size(); i += k) {
        int w = 0;
        for (int j = i; j <= i+k-1; j++) {
            if(a[j] == 'T') w++;
        }
        if(w == k) wynik++;
    }
    cout << wynik << "\n";
}