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#include <bits/stdc++.h>
#define qio ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define debug(x) cerr<<#x<<" "<<x<<endl
#define ll long long 
#define st first
#define nd second
using namespace std;

int n, res, temp;
string s;
int main()
{
	qio;
	cin >> n >> s;
	for (int i = 1; i <= 10; i++) {
		temp = 0;
		for (int j = (n / 10) * (i - 1); j < (n / 10) * i; j++) {
			if (s[j] == 'T') temp++;
		}
		if (temp == n / 10) res++;
	}
	cout << res << endl;

}