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#include <bits/stdc++.h>
#define ft first
#define sc second
#define pb push_back
#define FOR(i,n) for(int i=0; i<n; i++)
#define watch(x) cout << (#x) << " == " << (x) << endl
typedef long long ll;
typedef long double ld;
using namespace std;


int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);

int n;
string s;
cin>>n>>s;

int pkt=0;
FOR(i,10){
  bool ok=1;
  FOR(j,n/10){
    if (s[i*(n/10)+j] == 'N') {ok=0; break;}
  }
  pkt+=ok;
}

cout<<pkt;

return 0;
}