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#include <bits/stdc++.h>

using namespace std;



int main(){
    int n;
    cin >> n;

    int c = n/10;

    int res = 0;
    bool ok = 1;
    for(int i = 1; i <= n; i++){
        char t;
        cin >> t;
        ok = min(ok, t == 'T');
        if(i%c == 0){
            res += ok;
            ok = 1;
        }
    }
    cout << res << '\n';
    return 0;
}