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#include<bits/stdc++.h>
#define st first
#define nd second
#define pb push_back
#define mp(a, b) make_pair(a, b)
#define all(x) (x).begin(), (x).end()
#define rev(x) reverse(all(x))
#define sor(x) sort(all(x))
#define sz(x) (int)(x).size()
#define rsz(x) resize(x)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<pii > vii;
typedef vector<ll> vl;
typedef vector<pll> vll;
typedef string str;
#define BOOST ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);

string S;

int main()
{
    BOOST;
    int n;
    cin>>n;
    cin>>S;
    int blok = n/10, True, res = 0, j = 0;
    for(int i = 0; i < 10; i++)
    {
        True = 0;
        for(int k = 0; k < blok; k++)
        {
            if(S[j] == 'T') True++;
            j++;
        }
        if(True == blok) res++;
    }
    cout<<res;
    return 0;
}