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#include <bits/stdc++.h>

using namespace std;

#ifdef D
#define DEBUG(x)        \
    do {                \
        x               \
        cout.flush();   \
    } while (0)
#else
#define DEBUG(x)
#endif

using ll = long long;

const int NMAX = 1e6 + 7, R = 1 << 20;

int n, r, w;
char c;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    cin >> n;

    for (int i = 0; i < 10; ++i) {
        for (int j = 0; j < n / 10; ++j) {
            cin >> c;
            if (c == 'T') {
                w++;
            }
        }
        if (w == n / 10) {
            r++;
        }
        w = 0;
    }

    cout << r;

    return 0;
}