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

int wyn;

int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	int n;
	cin >> n;
	int b = n/10+1;
	
	for(int i = 11; --i;)
	{
		int t = 1;
		for(int j = b; --j;)
		{
			char c;
			cin >> c;
			if(c == 'N') t = 0;
		}
		wyn += t;
	}
	
	cout << wyn;
	return 0;
}