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#include <iostream>
#include <string>

int64_t n, k = 0, r = 0;
bool ok;
char s[101];

int main() {
    std::ios::sync_with_stdio(false);

    std::cin >> n;
    std::cin >> s;

    k = n / 10;

    ok = true;
    for (decltype(n) i = 0; i < n; i++) {
        if (s[i] != 'T') {
            ok = false;
        }

        if (i % k == k - 1) {
            if (ok) {
                ++r;
            }
            ok = true;
        }
    }

    std::cout << r << "\n";
}