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

int main()
{
	int x;
	cin>>x;
	cin>>tests;
	int points=0, testgroup = x/10;
	for(int i=0;i<10;++i){
		bool give = true;
		for(int j=0;j<testgroup;++j){
			if(tests[testgroup*i+j]=='N'){
				give = false;
				break;
			}
		}
		if(give)points++;
	}
	cout<<points;
	return 0;
}