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#include <iostream>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */
using namespace std;
int main() {
	
	int a;
	cin>>a;
	string s;
	cin>>s;
	int ile = a/10;
	int wynik = 0;
	int count = 0;
	bool x = true;
	for(int i=0;i<s.length();i++){
		count++;
		if(s[i]=='N'){
			x=false;
		}
		if(ile==count){
			count=0;
			if(x==true){
				wynik++;
			}
			x=true;
		}
		
	}
	cout<<wynik;
	return 0;
}