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

void solve() 
{
    int n;
    cin >> n;
    string s;
    cin >> s;

    int score = 0;
    int t = n / 10;

    for (int i = 0; i < 10; i++) {
        bool all_pass = true;
        for (int j = i * t; j < (i + 1) * t; j++) {
            if (s[j] != 'T')
                all_pass = false;
        }
        if (all_pass)
            score++;
    }

    cout << score << "\n";
}

int main() 
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    
    solve();
  
    return 0;
}