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#include <cstdio>

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

    int points = 0;
    for (int i = 0; i < 10; i++) {
        bool allTrue = true;
        for (int j = 0; j < n / 10; j++) {
            char c;
            scanf(" %c", &c);
            if (c != 'T') {
                allTrue = false;
            }
        }
        if (allTrue) {
            points++;
        }
    }
    printf("%d", points);
}