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#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define loop(i,x,n) for(ll i=x;i<n;i++)
#define loopr(i,x,n) for(ll i = n-1;i>=x;i--)
#define all(v) v.begin(),v.end()
#define print(v) for(auto xx : v){cout<<xx<<" ";}cout<<endl;
#define debug if(DEBUG) cout 
#define ff first
#define ss second
const ll Mod = 1E9+7, L = 1E18, N = 1E6+9;


int main(){
    ios_base::sync_with_stdio(false);
	cin.tie(NULL);  

    int n, ans = 0;
    cin >> n;
    string s; cin >> s;

    for(int i = 0;i<n;i+=(n/10)){
        bool ok = true;
        for(int j = i;j<i+n/10;j++){
            if (s[j] == 'N') ok = false;
        }
        ans += ok;
    }
    cout << ans << '\n';

}