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#include <bits/stdc++.h>

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;

using namespace std;


int main(){
	cin.tie(0);
	ios_base::sync_with_stdio(0);

	int n;
	cin >> n;
	string s;
	cin >> s;
	vector<int> dp(n+1, 0);
	for(int i = 1; i <= n; i++){
		dp[i] = dp[i-1] + (s[i-1] == 'T');
	}
	int ans = 0;
	for(int i = 0; i < n; i+=n/10){
		if (dp[i+n/10] - dp[i] == n/10){
			ans++;
		}
	}
	cout << ans << "\n";
}