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/******************************************************************************

                              Online C++ Compiler.
               Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.

*******************************************************************************/

#include <iostream>

using namespace std;

int main()
{
    int a,y=0;
    cin>>a;
    
    for(int i=0;i<10;i++){
        int x=0;
        for(int j=0;j<a/10;j++){
            char t;
            cin>>t;
            if(t=='T')
                x+=1;
            
            
            
        }
        
       if(x==a/10)
            y+=1;
            
        
        
        
    }
cout<<y;
    return 0;
}