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

                              Online C++ Compiler.
               Code, Compile, Run and Debug C++ program online.
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*******************************************************************************/

#include <bits/stdc++.h>
#define ll long long
using namespace std;
ll n,res;
int main()
{
    cin>>n;
    for(ll i=1; i<=10; i++){
        ll ch=1;
        for(ll j=1; j<=n/10; j++){
            char c; cin>>c;
            if(c=='N')
                ch=0;
        }
        if(ch==1)
            res++;
    }
    cout<<res;

    return 0;
}