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

int main(){
    int n;
    cin >> n;

    int ans = 0;

    for(int i = 0; i<10; ++i){
        bool ok = true;
        for(int j = i*(n/10); j<(i+1)*(n/10); ++j){
            char x;
            cin >> x;
            if(x == 'N') ok = false;
        }

        if(ok) ans++;
    }

    cout << ans << "\n";
}