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#include <bits/stdc++.h>

int main()
{
	std::ios_base::sync_with_stdio(0);
	
	std::string s;
	int n;
	std::cin >> n >> s;

	int m = n/10;
	int c = 0;
	int sum = 0;
	int e = 1;
	for(auto i=0; i<s.size(); i++)
	{
		if(s[i]=='N') e = 0;
		c++;
		if(c == m)
		{
			sum += e;
			e = 1;
			c=0;
		}
	}

	std::cout << sum << "\n";

	return 0;
}