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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define st first
#define nd second
#define pb push_back
#define mp make_pair
#define rep(i,a,b) for(ll i=(ll)a;i<=(ll)b;++i)
#define all(a) a.begin(),a.end()
#define sz(x) (int)(x).size()

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n; cin >> n;
    string s; cin >> s;
    s = '#'+s;
    int p = n/10;
    int res = 0;
    rep(i,1,10){
        bool ok = 1;
        rep(j,(i-1)*p+1,i*p) if(s[j] == 'N') ok = 0;
        if(ok) res++;
    }
    cout << res << "\n";
}