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//Author: Łukasz Pasek
#include<iostream>
#include<vector>
using namespace std;


int main()
{
    ios_base::sync_with_stdio(0);
    int n;
    cin >> n;
    vector<char> T(n);
    int box=n/10;
    int cou=0;
    int result=0;
    for (int i=1 ; i<=n ; i++) {
        cin>>T[i-1];
        if(T[i-1]=='T') cou++;
        if(cou==box) {result++;cou=0;}
        if(i%box==0)cou=0;
    }
    cout<<result<<endl;
    return 0;
}