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#include <bits/stdc++.h>
#define ss second
#define ff first
#define pb push_back
#define ll long long

//Igor Rostkowski


using namespace std;

int n,odp;
char c;
bool czy;

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

    cin>>n;

    for(int i=1;i<=10;i++)
    {
        czy=1;
        for(int j=1;j<=(n/10);j++)
        {
            cin>>c;
            if(c=='N') czy=0;
        }
        odp+=czy;
    }

    cout<<odp;

    return 0;
}