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#include <iostream>

using namespace std;

int main(){
	int n;
	string s;
	cin>>n;
	
	int div = n/10;
	
	char a;
	bool poss = true;
	int pkt = 0;
	for(int i = 1; i<=n; i++){
		cin>>a;
		if(a=='N') poss = false;
		
		if(i%div==0){
			pkt+=poss;
			poss = 1;
		}
	}
	
	cout<<pkt;
}