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#include <bits/stdc++.h>
using namespace std;

typedef long long int LL;

int main()
{
    ios_base::sync_with_stdio(0);

    int n;
    cin >> n;

    int casesCount = n/10;
    int points = 0;

    string s;
    cin >> s;

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

        for(int j = 0; j < casesCount; ++j)
        {
            if(s[i*casesCount + j] == 'N')
            {
                correct = false;
            }
        }

        points += correct;
    }

    cout << points << endl;

    return 0;
}