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#include<cstdio>

using namespace std;

int main() {

    int testsNum;
    scanf("%d\n", &testsNum);

    int testsInGroup = testsNum / 10;
    bool allPassed = true;
    int points = 0;

    for (int i = 0; i < testsNum; i++) {
        char passed;
        scanf("%c", &passed);

        allPassed &= (passed == 'T');
        if ((i + 1) % testsInGroup == 0) {
            if (allPassed) {
                points++;
            }

            allPassed = true;
        }
    }

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

}