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#include <iostream>
using namespace std;
int arr[10];

int main()
{
int n;
int sum=0;
cin>>n;
int m;
m=n/10;
string s;
cin>>s;
for(int i=0;i<n;i++){

    if(s[i]=='T'){arr[i/m]++;if(arr[i/m]==m){sum++;}}
}
cout<<sum;
    return 0;
}