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

int n, wynik, k, pom;
char tab[110];

int main () {

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

cin >> n;

k = n / 10;

for (int i = 0; i < n; ++i)
{
    cin >> tab[i];
}

for (int i = 0; i < n; ++i)
{
    if (tab[i] == 'T')
        pom++;

    if (pom == k)
    {
        wynik++;
        pom = 0;
    }

    if ((i + 1) % k == 0)
        pom = 0;

    if (tab[i] == 'N')
        pom = 0;

}

cout << wynik;

    return 0;
}