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#include <iostream>
#include <string>

using namespace std;

int main() {
    
    int n, block;
    string input;
    ios_base::sync_with_stdio(false);
    cin >> n >> input;
    block = n / 10;
    int cnt = 0;
    
    for (int i = 0; i < n; i += block) {
        
        int result = 1;
        for (int j = 0; j < block; j++)
            result &= input[i + j] == 'T';
        cnt += result;
    }
    
    cout << cnt;
    return 0;
}