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#include <bits/stdc++.h>
using namespace std;
typedef vector<int> VI;
typedef pair <int,int> ii;
typedef long long LL;
#define pb push_back
const int INF = 2147483647;

int x, d, res, i, j, ok;
char t[105];

int main() {
scanf("%d", &x);
scanf("%s", t);
d = x / 10;
res = 0;
for (i=0;i<10;i++) {
	ok = 1;
	for (j=i*d;j<(i+1)*d;j++) if (t[j] == 'N') ok = 0;
	if (ok) res++;
}
printf("%d\n", res);
return 0;
}