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

int main()
{
	int n;
	int res = 0;
	int tru = 0;
	string s;
	cin >> n >> s;
	for(int i = 0; i < 10; ++i)
	{
		for(int j = 0; j < (n/10); ++j)
		{
			tru = 0;
			if(s[i*n/10 + j] == 'N')
			{
				tru = 1;
				break;
			}
		}
		if(tru == 0)
			res++;

	}
	cout << res;
	return 0;
}