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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 t = n / 10;
    string s; cin >> s;
    int ans = 0;
    for (int i = 0; i < n; i += t) {
        if(count(s.begin() + i, s.begin() + i + t, 'T') == t)
            ans++;
    }
    cout << ans << "\n"; 
}