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#include <iostream>
#include <vector>
#include <map>
#include <algorithm>


using namespace std;

#define pb push_back
#define mp make_pair
#define st first
#define nd second
#define x first
#define y second

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;


int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int n;
    cin >> n;
    
    int m = n/10;
    
    int cnt = 0;
    
    
    for(int i=0; i<10; i++){
        bool cnd = true;
        for(int j=0; j<m; j++){
            char c;
            cin >> c;
            
            if(c=='N'){
                cnd=false;
            }
        }
        if(cnd==true){
            cnt++;
        }
        
    }
    
    cout << cnt;
    
    return 0;
}