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#include <bits/stdc++.h>
using namespace std;

int main(){
      int n, res = 0;
      char c;
      scanf("%d",&n);
      scanf("%c",&c);
      n /= 10;
      for (int i = 0; i < 10; ++i) {
            int tcounter = 0;
            for(int t = 0; t < n; ++t){
                  scanf("%c",&c);
                  if(c == 'T') tcounter++;
            }
            if(tcounter == n) res++;
      }
      printf("%d",res);

      return 0;

}