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

bool cnt(string &s, int a, int b)
{
    int i = a;
    
    while (s[i] == 'T' and i < a + b)
    {
        i++;
    }

    if (i == a + b)
    {
        return(true);
    }
    else
    {
        return(false);
    }
}

int main()
{
    int n, o = 0;
    string s;
    
    cin >> n >> s;

    for (int i = 0; i < n; i += n / 10)
    {
        if (cnt(s, i, n / 10) == true)
        {
            o++;
        }
    }

    cout << o << "\n";
}