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

int n;
int res;
bool p = true;
char c;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> n;
    for(int i = 0; i < 10; ++i){
        p = true;
        for(int j = 0; j < n; j+=10){
            cin >> c;
            if(c == 'N') p = false;
        }
        if (p) res++;
    }
    cout << res << endl;

    return 0;
}