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// Autor: Adam Szymaszkiewicz
#include <bits/stdc++.h>
using namespace std;
typedef long long LL;

int main()
{
	ios::sync_with_stdio(0); cin.tie(0);

	int n;
	cin >> n;
	bool flag = 1;
	int grup = n/10;
	int wyn = 0;
	for (int i = 0; i < n; i++)
	{
		if (i > 0 && i%grup == 0)
		{
			wyn += flag;
			flag = 1;
		}
		char a;
		cin >> a;
		if (a == 'N')
			flag = 0;
	}
	wyn += flag;
	cout << wyn << "\n";
}