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

//#define cerr if(false)cerr

int main()
{
	ios::sync_with_stdio(false); cin.tie(nullptr);
	int n;
	cin >> n;
	string s;
	cin >> s;
	int sub = n / 10;
	int ans = 0;
	for (int i = 0; i < n; i+=sub) {
		bool ok = true;
		for (int j = i; j < i+sub; j++) {
			if(s[j] == 'N') {
				ok = false;
			}
		}
		ans += ok;
	}
	cout << ans;
 
    return 0;
}