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#include <iostream>
#include <string>

using namespace std;

int main() {
    int n;
    string str;
    int size;
    int res {};

    cin >> n >> str;
    size = n/10;
    string pattern(size, 'T');

    for (int i=0; i<n; i+=size) {
        if (pattern.compare(str.substr(i, size)) == 0) {
            res++;
        }
    }

    cout << res << endl;
    return 0;
}