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#include <bits/stdc++.h>
using namespace std;
int cnt[105];
int32_t main() {
    int n;
    string s;
    cin >> n >> s;

    int per_test = n / 10;
    for (int i = 0; i < s.size(); i++) {
        cnt[i / per_test] += (s[i] == 'T');
    }

    int res = 0;
    for (int i = 0; i < n / per_test; i++) {
        res += (cnt[i] == per_test);
    }

    cout << res << "\n";
}