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#include <iostream>
#include <string>
using namespace std;

long long int a, n;
string s;

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	
	cin >> n;
	cin >> s;
	int i = 1;
	int pkt = 0;
	bool ok = true;
	for(char c : s)
	{
		//cout << c;
		if(c == 'N')
			ok = false;
		
		if(i%(n/10) == 0)
		{
			if(ok)pkt++;
			
			ok = true;
		}
		i++;
	}
	cout << pkt;
	return 0;
}