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#include <iostream>

using namespace std;

int main()
{
int n,t=1,x=0,wyn=0;
char temp;

cin>>n;

for(int a=0;a<n;a++)
{
cin>>temp;
if(temp=='T')x++;
if(t==n/10)
{
if(x==n/10)wyn++;
t=1;
x=0;
}
else t++;
}
cout<<wyn;
}