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

int n;
string s;
int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    cin >> n >> s;

    int res = 0;
    for (int i = 0; i < 10; i++){
        bool hehe = false;
        for (int c = 0; c < n/10; c++){
            if (s[i * (n/10) + c] == 'N')
                hehe = true;
        }
        if (!hehe)
            res++;
    }

    cout << res << "\n";
    return 0;
}