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#include<bits/stdc++.h>

using namespace std;
#define nd second
#define st first
#define pb push_back
typedef long long ll;
typedef long double ld;

void Solve()
{
    int n, akt, w = 0; string s;
    cin >> n;
    cin >> s;
    for(int i = 1; i <= 10; ++i)
    {
        akt = 1;
        for(int j = 0; j < n / 10; ++j)
            if(s[(i - 1) * (n / 10) + j] == 'N')
                akt = 0;
        w += akt;
    }
    cout << w << "\n";
}

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

    return 0;
}