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#include <iostream>
#include <string>

using namespace std;

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

    int n;
    cin >>  n;

    string s;
    cin >> s;


    int k = n/10;
    int result = 0;
    for (int i = 0; i < 10; i++)
    {
        bool passed = true;
        for (int j = 0;passed &&  j < k; j++)
        {
            if(s[k*i+j] == 'N')
            {
                passed = false;
            }
        }

        if(passed)
        {
            result++;
        }
    }
    
    cout << result <<'\n';
    return 0;
}