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#include <bits/stdc++.h>

using namespace std;

int n, wynik = 0;
string s;

int main()
{
    int l, r;

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin >> n >> s;

    r = n/10;

    for (int i = 0; i < 10; i++)
    {
        l = 0;

        for (int j = 0; j < r; j++)
            if (s[j+i*r] == 'T')
                l++;

        if (l == r)
            wynik++;
    }

    cout << wynik;

    exit(0);
}