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#include <cstdio>

int main() {
    int n;
    scanf("%d", &n);

    char rate[n];
    scanf("%s", rate);

    int score = 0;

    for (int i = 1; i < n + 1; ++i) {
        if (rate[i - 1] == 78) {
            i = (((i - 1) / (n / 10)) + 1) * (n / 10);
        } else if (rate[i - 1] == 84 && i % (n / 10) == 0) {
            score++;
        }
    }

    printf("%d", score);

    return 0;
}