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#include <bits/stdc++.h>
 
using namespace std;
 
#define endl '\n'
#define L long long
#define MP make_pair
#define REP(i, n) for(int i = 0; i < n; ++i)
#define REPR(i, n) for(int i = n - 1; i >= 0; --i)
#define FOR(i, a, b) for(int i = a; i < b; ++i)
#define FORR(i, a, b) for(int i = b - 1; i >= a; --i)
#define EB emplace_back
#define ST first
#define ND second
#define S size
#define RS resize
 
template<class T> using P = pair<T, T>;
template<class T> using V = vector<T>;
 
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
 
    int n;
    cin >> n;
    int res = 0;
    REP(i, 10) {
        bool all = true;
        REP(j, n / 10) {
            char c;
            cin >> c;
            if (c == 'N') {
                all = false;
            }
        }
        res += all;
    }
    cout << res;
}

// g++ -std=c++17 -Wall -Wextra -Wshadow -Wconversion -D_GLIBCXX_DEBUG pun.cpp -o pun