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#include<iostream>
using namespace std;
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n;
    string h;
    cin>>n>>h;
    int l=n/10;
    int current=0;
    int wynik=0;
    for(int i=0;i<n;++i){
        if(i+1>=l && h[i-l]=='T'){
                --current;
        }
        if(h[i]=='T')
            ++current;
        if(current==l)
            ++wynik;
    }
    cout<<wynik;
    return 0;
}