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#include<bits/stdc++.h>
using namespace std;

int main()
{
    int n; cin >> n;
    string s; cin >> s;
    int count = 0, timer = 0, ans = 0;
    for (int i = 0; i < s.size(); i++)
    {


        if(s[i] == 'T') 
        {
            count++;
            
        }
        timer++;
        if(timer == n / 10 && count == n / 10)
        {
            ans++;
        }
        if(timer == n / 10) 
        {
            count = 0;
            timer = 0;
        }
    }
    cout<<ans;
}