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#include<iostream>

using namespace std;

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

    string word;
    cin>>word;

    word='#'+word;

    int k=n/10;

    int points=0;

    for(int i=0;i<10;i++)
    {
        int counter=0;
        for(int j=1;j<=k;j++)
        {
            if(word[i*k+j]=='T')
            {
                counter++;
            }
        }

        if(counter==k)
        {
            points++;
        }
    }

    cout<<points<<endl;

    return 0;
}