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#include <bits/stdc++.h>

using namespace std;

int compare(string inp, int l, int it)
{

    bool val =1;
    while(it < l)
    {
        if(inp[it] != 'T')
        {
            val = 0;
            break;
        }
      ++it;
    }

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

    int n;
    cin >> n;
    string inp;
    cin >> inp;

    int res=0;
    for(int i=n/10; i<=n; i+= n/10)
    {
        res += compare(inp, i,i - n/10);
       // cerr << res;
    }
    cout << res;

    return 0;
}