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#include <iostream>
#include <string>

using namespace std;

int main() {

	int n;
	cin >> n;

	string str;
	cin >> str;

	int g = n / 10;
	int p = 0;

	for (int x = 1; x <= str.size(); x++) {

		if (str[x - 1] == 'N') {

			int shift = 0;
			
			if(x%g>0) shift = g - (x % g);

			x += shift;

			continue;

		}

		if (x % g == 0) {

			p++;

		}

	}

	cout << p;

}