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#include <bits/stdc++.h>

using namespace std;

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

    int n, res = 0;
    cin >> n;
    n /= 10;
    
    string s;
    cin >> s;

    for (int i = 0; i < n * 10; i += n) {
        bool czy = 1;
        for (int j = i; j < i + n; j++) {
            if (s[j] == 'N') {
                czy = 0;
                break;
            }
        }
        res += czy;
    }

    cout << res;
}