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#include <cstdio>
#include <cstdlib>

int main() {
    char answers[256];
    int numTests, groupSize, result = 0;
    bool ok = true;

    fgets(answers, 256, stdin);
    numTests = strtol(answers, nullptr, 10);
    groupSize = numTests / 10;
    fgets(answers, 256, stdin);

    for (int no=0, grNo=0; no<numTests; ++no, ++grNo) {
        if (grNo == groupSize) {
            if (ok)
                ++result;

            ok = true;
            grNo = 0;
        }

        if (answers[no] != 'T')
            ok = false;
    }

    if (ok)
        ++result;

    printf("%d\n", result);

    return 0;
}