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#include <iostream>
#include <algorithm>
#include <vector>
#include <map>
   
#define push push_back
#define ll long long
   
using namespace std;
   
int main() {
   ios_base::sync_with_stdio(0);
   cin.tie(0);

   int n;
   cin >> n;

   vector<bool> T(n);
   for(int i = 0; i < n; i++) {
       char temp;
       cin >> temp;

       if(temp == 'T') {
           T[i] = 1;
       }else {
           T[i] = 0;
       }
   }  
   
   int gR = (n/10);
   int gmR = (n/gR);
   vector<int> cR(gmR);

   for(int i = 0; i < n; i++) {
       int gcR = ((i)/(gR));
       if(T[i] == 1){
            // cout << i << " | " << T[i] << " " << gcR << "\n";
           cR[gcR]++;
       }
   }

   int result = 0;

   for(int i = 0; i < gmR; i++) {
    //    cout << cR[i] << "\n";
       if(cR[i] == gR) {
           result++;
       }
   }

   cout << result << "\n";
}