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

int main() {
    int size;
    string tests;
    cin >> size;
    cin >> tests;
    int group_size = size / 10;
    int points = 0;
    for(int i = 0; i < size; i += group_size) {
        bool isGood = true;
        for(int k = i; k < i + group_size; k++) {
            if (tests[k] != 'T') {
                isGood = false;
                break;
            }
        }
        if(isGood) {
            points++;
        }
    }
    cout << points << endl;
    return 0;
}