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#include<iostream>
using namespace std;

int main(){
    int n;
    cin>>n;
    string s;
    cin>>s;
    int g=n/10;
    int c=0;
    int res=0;
    for (int i = 1; i <= n; i++)
    {
        if(s[i-1]=='T'){
            c++;
        }
        if(i%g==0){
            if(c==g){
                res++;
            }
            c=0;
        }
    }
    cout<<res;
    return 0;
}