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#include <cstdio>
#include<cmath>
#include<iostream>
#include<algorithm>
#include<cstring>
#include<cstdlib>
#include<vector>
#include<set>
#include<map>
#include<queue>

using namespace std;


int main() {

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n; cin >> n;
    int m = n / 10;
    int res = 0;
    for(int i = 0; i < 10; i ++) {
        bool ok = true;
        for(int j = 0; j < m; j ++) {
            char x; cin >> x;
            if(x == 'N') ok = false;
        }
        if(ok) res ++;
    }
    cout << res << endl;
    return 0;
}