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#include <iostream>
#include <cstdio>
#include <string>
#include <sstream> 
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <cmath>
#include <algorithm>
#include <cstring>
#include <ctime>
#include <cassert>
using namespace std;

#define assert_range(x,a,b) assert((a) <= (x) and (x) <= (b))
using ll = long long;
const int INF = 1e9;

int main() {
    ios_base::sync_with_stdio(0);
    int n, m;
    cin >> n;
    m = n/10;
    string s;
    cin >> s;
    int res = 0;
    for (int i = 0; i < 10; ++i) {
        bool all_good = 1;
        for (int j = 0; j < m; ++j) {
            if (s[m*i+j] != 'T') {
                all_good = false;
            }
        }
        res += all_good;
    }
    cout << res << endl;
    return 0;
}