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#include <iostream>
using namespace std;

int main() {

  int n;
  scanf("%d", &n);

  int counter = 0, ans = 0;

  bool group = true;

  char test;

  for(int i = 0; i < n; i++) {
    scanf(" %c", &test);

    if(test == 'N') {
      group = false;
    }

    counter++;

    if(counter == n/10) {
      if(group == true) {
        ans++;
      }
      counter = 0;
      group = true;
    }
  }

  printf("%d", ans);

  return 0;
}