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#include <iostream>

using namespace std;

long long n,k,p;
string a;


int main()
{
    cin>>n;
    cin>>a;
    for(int i=0; i<n; i++)
    {if(a[i]=='T') k++;
    if(a[i]!='T') k=0;
    if(k==n/10) {p++; k=0;}
    }     
    
    cout<<p;

    return 0;
}