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

string s;

bool check(int x, int y)
{
	for (int i=x; i<y; i++)
		if (s[i] == 'N') return false;
	return true;
}

int main()
{
	int n, res = 0;
	cin >> n >> s;
	int r = n/10;
	for (int i=0; i<=n-r; i+=r)
		if (check(i, i+r) == true) res++;
	cout << res;
	return  0;
}