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#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;
#define rep(a, b) for(int a = 1; a <= (b); ++a)
#define st first
#define nd second
#define pb push_back
#define all(a) a.begin(), a.end()

const int MAX_N = 1e6 + 7;
vector<int> a(MAX_N);

int main(){
//ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
	int n; cin >> n;
	int cnt = 0, res = 0;
	string testy; cin >> testy;
	rep(i,n){
		if(testy[i-1] == 'T') cnt++;
		if(i % (n / 10) == 0){
			if(cnt == n/10) res++;
			cnt = 0;
		}
	}
	cout << res;
	return 0;
}