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#include<cstdio>

char c[200];

int main(){
    int n;
    scanf("%d%s", &n, c);
    int s = 0;
    for (int i = 0; i < 10; i++) {
        int all = 1;
        for (int j = 0; j < n / 10; j++) {
            all &= c[i * n / 10 + j] == 'T';
        }
        s += all;
    }
    printf("%d\n", s);
    return 0;
}