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#include<bits/stdc++.h>
#define fi first
#define se second
using namespace std;
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int n;
	cin>>n;
	int ans=0;
	for(int i=1;i<=10;i++)
	{
		int c=1;
		for(int j=1;j<=n/10;j++)
		{
			char ch;
			cin>>ch;
			if(ch=='N')
				c=0;
		}
		ans+=c;
	}
	cout<<ans<<"\n";
	return 0;
}