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#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,b) for (int i = (a); i <= (b); ++i)
#define REPD(i,a,b) for (int i = (a); i >= (b); --i)
#define FORI(i,n) REP(i,1,n)
#define FOR(i,n) REP(i,0,int(n)-1)
#define mp make_pair
#define pb push_back
#define pii pair<int,int>
#define vi vector<int>
#define ll long long
#define SZ(x) int((x).size())
#define DBG(v) cerr << #v << " = " << (v) << endl;
#define FOREACH(i,t) for (typeof(t.begin()) i=t.begin(); i!=t.end(); i++)
#define fi first
#define se second

int ok[22];
int main() {
	int n,k,tot=0;
	string s;
	cin >> n >> s;
	k = n/10;
	FOR(i,10) ok[i]=1;
	FOR(i,n) ok[i/k] &= s[i]=='T';
	FOR(i,10) tot += ok[i];
	cout << tot << "\n";
	return 0;
}