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#include <iostream>
#include <string>

using namespace std;

int main()
{
    string t;
    int n;
    int p=0;
    cin >> n;
    cin >> t;
    for (int i=0;i<n;i+=n/10)
    {
        int temp = 0;
        for (int j=0;j<n/10;j++)
        {
            if (t[i+j]== 'T')
            {
                temp++;
            }
        }
        if (temp == n/10)
        {
            p++;
        }
    }
    cout << p;
}