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#include <bits/stdc++.h>
     
using namespace std;
     
#define turbo cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(false)
#define inf 1999999999
#define biginf 199999999999999999
#define pb push_back
#define mp make_pair
#define pii pair<int,int>
#define ll long long
#define f first
#define s second
#define int long long


signed main() {
	turbo;
	int n, res = 0;
	char c;
	cin >> n;
	for(int i = 0; i < 10; i++) {
		int possible = true;
		for (int j = 0; j < n / 10; j++) {
			cin >> c;
			if (c == 'N')
				possible = false;
		}
		if (possible)
			res++;
	}
	cout << res << "\n";
	return 0;
}