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#include <iostream>
#include <string>
#include <vector>
using namespace std;



int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);

    int n = 0;
    int n2 = 0;
    int ile = 0;

    cin >> n;

    n2 = n / 10;

    for (int i = 0; i < 10; i++)
    {
        bool dobrze = true;

        for (int j = 0; j < n2; j++)
        {
            char a;
            cin >> a;
            if (a == 'N')
            {
                dobrze = false;
            }
        }

        if (dobrze)
        {
            ile++;
        }  
    }

    cout << ile;

}