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#include <bits/stdc++.h>
using namespace std;
#define fastio ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)

int n;

int main(){
  fastio;
  cin >> n;
  
  bool ok = true;
  int sum = 0;
  for(int i = 1; i <= n; i++){
    char c; cin >> c;
    if(c == 'N') ok = false;
    if(i % (n/10) == 0) sum += ok, ok = true;
  }

  cout << sum << "\n";
}