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#include <iostream>
using namespace std;
int main()
{
	cin.tie(0);
	cout.tie(0);

	int n;
	cin >> n;
	
	string x;		
	cin>>x;

	int wynik = 0;

	int ilosc = n / 10;
	
	int count = 0;
	
	for(int i = 0; i < n; i++)
	{
		
		count++;
		
		if(x[i]=='N')
		{
			i+=ilosc-count;
			count = 0;
			continue;
		}
		
		if(count == ilosc)
		{
			wynik++;
			count=0;
		}
		
	}
	
	cout<<wynik;
	
}