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#include <iostream>

#define boost ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)

using namespace std;

const int GROUP_COUNT = 10;

int n, groupSize, result;
string s;

bool didGroupPass(int firstIndex, int lastIndex) {
    for (int it = firstIndex; it <= lastIndex; it++) {
        if (s[it] != 'T') {
            return false;
        }
    }
    return true;
}

int main() {
    boost;

    cin >> n;
    cin >> s;

    groupSize = n / GROUP_COUNT;
    for (int i = 0; i < GROUP_COUNT; i++) {
        result += didGroupPass(i * groupSize, (i + 1) * groupSize - 1);
    }

    cout << result << endl;
}