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#include <iostream>

using namespace std;

int main()
{
ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
   int n;
   int suma=0;
   string s;
   cin>>n;
   cin>>s;
   for (int i=0;i<n;i=i+n/10){
    int pomoc=1;
    for (int j=0;j<(n/10);j++){
        if (s[i+j]=='T'){
           pomoc=pomoc*1;
        }else
        {
            pomoc=pomoc*0;
        }
    }
    suma=suma+pomoc;
   }
   cout<<suma;
}