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#include <iostream>
using namespace std;
int main()
{
    int n, k=0;
    string s;
    cin>>n;
    cin>>s;
    for(int i=0; i<n; i+=2)
    {
        if((s[i]=='T')&&(s[i+1]=='T')) k++;
    }
    cout<<k;
    return 0;
}