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// #include <bits/stdc++.h>
#define FAST ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0);
#include <iostream>
#include <vector>
using namespace std;
int gcd(int a, int b) { return b ? gcd(b, a % b) : a; }

void solve()
{
}

int main()
{
    FAST int n;
    cin >> n;

    const int group_size = n / 10;
    int total = 0;
    char tmp;
    for (int i = 0; i < 10; i++)
    {
        bool success = true;
        for (int j = 0; j < group_size; j++)
        {
            cin >> tmp;
            if (tmp == 'N')
            {
                success = false;
            }
        }
        if (success)
        {
            total++;
        }
    }
    cout << total << endl;
}