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#include <bits/stdc++.h>

using namespace std;

#define FOR(i,a,b) for(int i = (a); i <= (b); ++i)
#define FORD(i,a,b) for(int i = (a); i >= (b); --i)
#define RI(i,n) FOR(i,1,(n))
#define REP(i,n) FOR(i,0,(n)-1)
#define mini(a,b) a=min(a,b)
#define maxi(a,b) a=max(a,b)
#define pb push_back
#define st first
#define nd second
#define sz(w) (int) w.size()
typedef vector<int> vi;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<pii, int> para;
const ll inf = 1e18 + 7;
const ll maxN = 1e6 + 5;
const ll MOD = 1e9 + 7;

int main() {
    int n; cin >> n;
    string s; cin >> s;
    int ans = 0;
    for (int i = 0; i < n; i += n / 10) {
        bool ok = true;
        for (int j = i; j < i + n / 10; j++) {
//            cout << s[j] << " " << ok << endl;
            if (s[j] != 'T') ok = false;
        }
//        cout << endl;
        ans += ok;
    }
    cout << ans << endl;
    return 0;
}