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#include <bits/stdc++.h>
using namespace std;
#define endl '\n'

int main() {
	int n, count=0;
	char c;
	bool br=false;
	cin >> n;
	for (int i=0; i<10; ++i) {
		for (int j=0; j<(n/10); ++j) {
			cin >> c;
			if (!br &&  c == 'N') br=true;
		}
		if (br) br=false;
		else count++;
	}
	cout << count << endl;
}