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#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

int main()
{
    ios_base::sync_with_stdio(0);
    int n;
    cin >> n;
    string s;
    cin >> s;

    int step = n / 10;
    ll result = 0;
    for (int i = 0; i < s.size(); i += step) {
        bool point = true;
        for (int j = 0; j < step && i + j < s.size(); ++j) {
            point = point && (s[i+j] == 'T');
        }
        if (point) result++;
    }
    cout << result;
}