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#include <cstdio>

char t[101];

int main() {
    int n;
    scanf("%d", &n);
    int x = n / 10;
    scanf(" %s", t);
    int res = 0;
    for (int i = 0; i < n; i += x) {
        bool ok = true;
        for (int j = i; j < i + x; ++j) {
            ok &= (t[j] == 'T');
        }
        if (ok) {
            res++;
        }
    }
    printf("%d\n", res);
    return 0;
}