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#include<bits/stdc++.h>
 
using namespace std;
 
using ll = long long;
using vi = vector<int>;
using pi = pair<int, int>;
using vpi = vector<pi>;
#define FOR(x, b, e) for(int x = b; x <= (e); ++x)
#define FORD(x, b, e) for(int x = b; x >= (e); --x)
#define REP(x, n) for(int x = 0; x < (n); ++x)
#define ALL(c) (c).begin(), (c).end()
#define ALLD(c) (c).rbegin(), (c).rend()
#define SIZE(x) ((int)(x).size())
#define pb push_back
#define pp emplace_back
#define st first
#define nd second
#define sq(a) (a)*(a)
const int inf = 1000000001;
const double eps = 1e-9;
bool fleq(double a, double b){
	return abs(a - b) < eps;
}

int n, ans;

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n;
	REP(i, 10){
		bool punkt = 1;
		REP(j, n/10){
			char c;
			cin >> c;
			punkt &= (c == 'T');
		}
		ans += punkt;
	}
	cout << ans << '\n';
	return 0;
}