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

int main()
{
    std::ios_base::sync_with_stdio(false);
    int k;
    std::cin>>k;
    std::string results;
    std::cin>>results;
    int n = k/10;
    int points = 0;
    for(int i =0; i <10; ++i)
    {
        if (std::all_of(results.cbegin() +n*i, results.cbegin()+n*i+n, [](char c){ return c == 'T'; })) {
            ++points;}
    }
    std::cout<<points<<std::endl;
    return 0;
}