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#include <bits/stdc++.h>

using namespace std;

int n;
char c[105];
int w = 0;

int main() {
	scanf("%d\n", &n);
	scanf("%s", c);
	bool tru = true;
	for(int i = 0; i < n; ++i) {
		if(c[i] == 'N') tru = false;
		if((i+1)%(n/10) == 0) {
			if(tru) w++;
			tru = true;
		}
	}
	printf("%d\n", w);
}