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#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back


char tab[1000];
int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    int n; cin >> n;
    for(int i = 1; i <= n; i++)
    {
        cin >> tab[i];
    }

    ll ans = 0;
    int grupa = n/10;
    for(int i = 1; i <= n; i+=grupa)
    {
        bool good = 1;
        for(int j = i; j < i+grupa; j++)
        {
            if(tab[j] == 'N') good = 0;
        }
        ans += good;
    }
    cout << ans;



}