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#include <iostream>
using namespace std;

int n, n10;
int points = 0;
bool correct = true;
char results[100];

int main(){
  cin >> n10;
  cin >> results;
  n = n10/10;
  for(int i=0; i<10; i++){
    correct = true;
    for(int j=0; j<n; j++){
      if(results[n*i + j] == 'N'){
        correct = false;
      }
    }
    if(correct){
      points++;
    }
  }
  cout << points << endl;
}