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#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <bits/stdc++.h>
 
using namespace __gnu_pbds;
using namespace std;
#define rep(i,a,n) for (int i=a;i<n;i++)
#define per(i,a,n) for (int i=n-1;i>=a;i--)
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second
#define SZ(x) ((int)(x).size())
typedef vector<int> VI;
typedef long long ll;
typedef pair<int,int> PII;
typedef double db;
mt19937_64 mrand(1);
const ll mod=1000000007;
int rnd(int x) { return mrand() % x;}
ll powmod(ll a,ll b) {ll res=1;a%=mod; assert(b>=0); for(;b;b>>=1){if(b&1)res=res*a%mod;a=a*a%mod;}return res;}
ll gcd(ll a,ll b) { return b?gcd(b,a%b):a;}
// head

const int N = 1e3+5;
char s[N];

int main() {
	int n;
	scanf("%d", &n);
	scanf("%s", s);
	int cnt = 0, ans = 0;
	rep(i, 1, n + 1) {
		if (s[i - 1] == 'T') cnt++;
		if (i % (n / 10) == 0) {
			if (cnt == n / 10) ans++;
			cnt = 0;
		}
	}
	printf("%d\n", ans);
}