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#include <bits/stdc++.h>     
using namespace std;
 
#define st first
#define nd second
#define g0 get<0> 
#define g1 get<1> 
#define g2 get<2> 
#define double long double


main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	int n;
	cin>>n;
	string s;
	cin>>s;
	int ile=0;
	for(int i=0; i<n; i+=n/10)
	{
		bool tak=1;
		for(int j=i; j<i+n/10; j++)
		{
			if(s[j]=='N')
				tak=0;
		}
		ile+=tak;
	}
	cout<<ile;
}