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#include <iostream>
#include <string>
#include <algorithm>
#include <vector>

using namespace std;

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

    int n;
    string s;
    cin >> n >> s;

    bool res;
    int score = 0;
    int i = 0;

    for (int block = n / 10; block <= n; block += n / 10)
    {
        res = true;
        for (;i < block; ++i) res &= s[i] == 'T';
        if (res) ++score;
    }
    
    cout << score;
}