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#include <iostream>

using namespace std;
int tab[102];
int main()
{
    int n;
    cin>>n;
    int w=0;
    for(int i=1;i<=n;i++){
        char c;
        cin>>c;
        if(c=='T'){tab[i]=tab[i-1]+1;}else{tab[i]=0;}
    }
    for(int j=n/10;j<=n;j+=(n/10)){
        if(tab[j]>=(n/10)){w++;}
    }
    cout<<w;
    return 0;
}