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#include<bits/stdc++.h>

using namespace std;


int main()
{
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    int n; cin >> n;
    string str; cin >> str;
    
    int points = 0;
    for (int i = 0; i < 10; i++)
    {
        bool passed = true;
        for (int j = 0; j < n/10; j++)
            if (str[i*(n/10) + j] == 'N')
            {
                passed = false;
                break;
            }
        
        if (passed)
            points++;
    }

    cout << points << "\n";
}