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#include <bits/stdc++.h>

using namespace std;

int main()
{
    int n;
    cin >> n;
    string s;
    cin >> s;

    int x = n / 10;
    string wzo = "";
    for(int i = 0; i < x; i++) wzo += 'T';
    int points = 0;
    for(int i = 0; i < n; i += x) if(s.substr(i, x) == wzo) ++points;
    cout << points;

    return 0;
}