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#include <iostream>
using namespace std;
  
int main()
{
    // added the two lines below
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);   
      
    int n;
    cin >> n;
    string s;
    cin >> s;
    int group = n/10;
    int points = 0;
    for(int i = 0; i < 10; ++i) {
        bool group_ok = true;
        for(int j = 0; j < group; ++j) {
            if(s[i*group+j] == 'N') {
                group_ok = false;
                break;
            }
        }
        points += group_ok;
    }
    cout << points << '\n';
    return 0;
}