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

template<typename _T> void _debug(const char *s, _T x){ cerr << s << " = " << x << "\n";}
template<typename _T, typename... R> void _debug(const char *s, _T x, R... r){ while(*s != ',') cerr << *s++; cerr << " = " << x << ", "; _debug(s + 1, r...);}
 
#define debug(...)  _debug(#__VA_ARGS__,  __VA_ARGS__);
 
#define sz(s)   int32_t(s.size())
 
using ll = long long;
using ld = long double;

#define int ll

int32_t main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int n;  cin >> n;
    string s;   cin >> s;
    int ans = 0;
    for(int i = 0; i < n; i += n / 10){
        int cnt = 0;
        for(int j = i; j < i + (n / 10); j++){
            cnt += (s[j] == 'T');
        }
        ans += (cnt == n / 10);
    }
    cout << ans << "\n";
}