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#include <bits/stdc++.h>

using namespace std;


int main() {
  int n;
  scanf("%d", &n);
  n /= 10;
  string s;
  cin >> s;
  int p = 0;
  for (int i = 0; i < 10; i++) {
    int p2 = 1;
    for (int j = n * i; j < n * i + n; j++) if (s[j] == 'N') p2 = 0;
    p += p2;
  }
  printf("%d\n", p);
}