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#include <cstdio>

char results[128];
int group_size;
int length;
int points;

int main(void)
{
    scanf("%d %s", &length, results);
    group_size = length / 10;
    for(int s = 0; s < length; s += group_size)
    {
        bool success = true;
        for(int i = s; success && i < s + group_size; ++i)
            success = results[i] == 'T';

        points += success;
    }

    printf("%d\n", points);
    return 0;
}