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#include <bits/stdc++.h>

#define ll long long

using namespace std;

int main() {
    std::ios::sync_with_stdio(false);
    ll n, res = 0;
    cin >> n;
    string S;
    cin >> S;
    const ll rounds = 10;
    for(ll i = 0; i < rounds; i++) {
        bool all_good = true;
        for(ll j = 0; j < (n / rounds); j++)
            all_good &= S[i * (n / rounds) + j] == 'T';
        if(all_good) res += 1;
    }
    cout << res << "\n";
    return 0;
}