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#include <bits/stdc++.h>
#define int long long
#define cln cout<<"\n---------------\n"
using namespace std;

constexpr int N = 1e6;
constexpr int MOD = 1e9+7;


int32_t main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    int n; cin>>n;
    int res = 0;
    char c;
    for (int i=0; i<10; ++i) {
        int ile = 1;
        for (int j=0; j<n/10; ++j) {
            cin>>c;
            if (c == 'N') ile = 0;
        }
        res += ile;
    }
    cout<<res;
    return 0;
}