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#include <iostream>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n; 
    cin >> n;
    string x;
    cin >> x;
    int help = 0;
    int ans = 0, ans2 = 0;
    for (int i = 0; i < x.length(); i++)
    {
        int key = n / 10;
        if (x[i] == 'T')
        {
            help++;
            ans2++;
            if (help == key and ans2 == key)
            {
                
                ans++;
            }
        }
        else
        {
            help++;
        }
        if (help == key)
        {
            help = 0;
            ans2 = 0;
        }
    }
    cout << ans;
}