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#include <iostream>

using namespace std;

int main()
{
    int n, wynik=0;
    string testy;
    cin>>n>>testy;
    int p=n/10;
    for (int i=0; i<n; i+=p){
        if (testy[i]=='T'){
            bool c=true;
            for (int j=1; j<p; j++){
                if (testy[i+j]=='N'){
                    c=false;
                    j=p+1;
                }
            }
            if (c) wynik++;
        }
    }
    cout<<wynik;

    return 0;
}