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// Marcin Knapik

#include<bits/stdc++.h>
using namespace std;

#define FOR(i, n) for (int i = 0; i < n; i++)

void solve () {
    int n;
    cin >> n;

    string s;
    cin >> s;

    int score = 0;
    FOR(i, 10){
        score += s.substr(i * n / 10, n / 10) == string(n / 10, 'T');
    } 

    cout << score << '\n'; 
}

int main () {
    ios::sync_with_stdio(0);
    cin.tie(0);

    int tests = 1;
    // cin >> tests;

    for (int test = 1; test <= tests; test++) {
        solve();
    }

    return 0;
}