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



int main (){
    int n,i,k,wynik=0,j,p=0;
    cin>>n;
    k = n/10;
    string slowo;
    cin>>slowo;
    for (i=0;i<10;++i){
        for (j=0;j<k;++j){
            if (slowo[i*k+j]=='T') ++p;
            //cout<<slowo[i*10+j]<<" ";
        }
        if (p==k) ++wynik;
        p = 0;
    }
    cout<<wynik;

    return 0;
}