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#include <iostream>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int n, ny,pkt =0;
    cin >> n;
    ny = n / 10;
    int counter;
    for (int i = 0; i < n; i+=ny) {
        counter = 0;
        for (int j = i; j < ny + i; ++j) {
            char x;
            cin >> x;
            if (x == 'T') ++counter;
        }
        if (counter == ny) {
            ++pkt;
        }
    }
    cout << pkt;

    return 0;
}