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//Wojciech Rybak Zbigniew100noga
#include <bits/stdc++.h>
using namespace std;

#define int long long
#define ll long long
#define pb push_back
#define nd second
#define st first
#define sz size
#define forr(i, n) for(int i=1;i<=n;i++)
const ll infl=1e18+90;
const int inf=1e9+90;

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n;
    cin>>n;
    string a;
    cin>>a;
    a='#'+a;
    int wyn=0;
    for(int i=0;i<10;i++)
    {
        bool zap=0;
        for(int j=i*(n/10)+1;j<=(i+1)*(n/10);j++)
        {
            if(a[j]=='N') zap=1;
        }
        if(zap==0) wyn++;
    }
    cout<<wyn<<"\n";
}